Question Of The Day(AIEEE)

A particle moves along the xaxis as x = u(t-1)2 + a(t-3)3 [a] initial velocity of the particle is u [b] the acceleration of the particle is a [c] the acceleration of the particle is 2a [d] the particle is at the origin at time t=3 seco...

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Question Of The Day(CET)

A straight wire of diameter 0.5mm carrying a current of 1A is replaced by another wire of radius 1mm diameter and carrying the same current. The strength of the magnetic field far away is [a] twice the earlier value [b] one half of the earlier value [c] one quarter of the earlier value [d] same as the earlier va...

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Electric Current Basics

Electric Current Basicsvar docstoc_docid="110922988";var docstoc_title="Electric Current Basics";var docstoc_urltitle="Electric Current Basic...

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Electrostatics Basics

ElectroStatics Basicsvar docstoc_docid="110922571";var docstoc_title="ElectroStatics Basics";var docstoc_urltitle="ElectroStatics Basic...

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Question Of The Day(AIEEE)

Find the angle of minimum deviation for an equilateral prism made of a material of refractive index 1.732. What is the angle of incidence for this deviation ?a)60b)0c)30d...

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Question Of The Day(CET)

If the resistivity of potentiometer wire be ρ and area of cross section be A, then what will be the potential gradient along the wire? [a] Iρ/A [b]I/ρA [c] IA/ρ [d] ...

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Magnetic Effect Of Electric Current Notes

Magnetic Effect Of Electric Currentvar docstoc_docid="110857591";var docstoc_title="Magnetic Effect Of Electric Current";var docstoc_urltitle="Magnetic Effect Of Electric Curren...

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Question Of The Day

IN NPN transistor, the collector current is 24mA. If 80% of the electrons reach collector, the base current in mA is              [a] 36                                       [b] 26             [c] 16                                      ...

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Question Of The Day

Within depletion region of the pn junction diode              [a] p side is positive and n side is negative             [b] p side is negative and n side is +ive             [c] both sides are either positive or negative             [d] both sides are neut...

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Question Of The Day

Two batteries of different emfs are connected in series with each other and with external load resistance. The current is 3A. when the polarity of one of the batteries is reversed the current is 1A. the ratio of emf’s of the two batteries is         [a] 2.5                     [b] 2        [c] 1.5                    ...

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Question Of The Day

The magnitude of earth’s magnetic field at the North pole is B0­. a horizontal conductor of length l moves with velocity v. the direction of v is perpendicular to the conductor. The induced emf is         [a] zero, if v is vertical          [b] B0lv, if v is vertical        [c] zero, if v is horizontal       [d]B0lv is v is horizont...

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Question Of The Day,

A vertical conducting ring of radius R falls vertically in a horizontal magnetic field of magnitude B. the direction of B is perpendicular to the plane of the ring. When the speed of the ring is v,           [a] no current flows in the ring        [b] A and D are at the same potential.        [c] C and E are at the same potential        [d] the potential difference between A and D is 2Brv, with D...

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Theory Of Relativity(Animation)

A spaceship is flying a distance of 5 light hours, for example from Earth to the dwarf planet Pluto. The speed can be regulated with the upper buttons. The applet demonstrates that the clock in the spaceship goes more slowly than the two clocks of the system in which Earth and Pluto are motionless. For Animation CLICK HER...

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Diffraction of Light by a Single Slit(Animation)

For Animation CLICK H...

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Interference of Light at a Double Slit(Animation)

In this Animation you can vary the wavelength,spacing between the slits,angle and you can observe the effect of this on width of fringe and intensity of fringe, For Animation CLICK H...

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Image Formation by Converging Lenses(Animation)

For Animation CLICK H...

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Reflection and Refraction of Light Waves(Animation)

This applet is a sort of tutorial which explains the reflection and the refraction of waves by the principle of Huygens. Explanations of each of the steps are provided in the text box. Whenever a step is finished, press the "Next step" button! You can stop and continue the simulation by using the "Pause / Resume" button. The three text fields make it possible to vary the index of refraction of both media and the angle of incidence. The medium with the smaller index of refraction (the bigger phase velocity) is painted yellow, the other blue. For...

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Refraction of Light(Animation)

A ray of light coming from the top left strikes the boundary surface of two media. (It is possible to choose the substances in both lists.) The medium which has the bigger index of refraction is painted blue, the other yellow. You can vary the incident ray with pressed mouse button. The applet will show the reflected and the refracted ray and calculate the corresponding angles: Angle of incidence(black) Angle of reflection(blue) Angle of refraction(red) For Animation CLCK H...

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of a Straight Current-Carrying Wire(Animation)

An electric current produces a magnetic field. This applet simulates an experiment concerning the magnetic field of a straight current-carrying wire. A large current passes through a vertical wire. You can reverse the direction of this current by using the red button. The signs at the ends of the wire symbolize the poles of the connected battery. The conventional direction of current is given by the red arrow. Note that the motion of the electrons (green dots) is opposite to the conventional direction! A compass needle which can be moved (by dragging...

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Lorentz Force(Animation)

This Java applet demonstrates the Lorentz force, exerted on a current-carrying conductor swing in the magnetic field of a horseshoe magnet. You can switch on (off) the current by using the upper button ("On / Off"). The other two buttons ("Reverse current" and "Turn magnet") make it possible to change the direction of the current respectively of the magnetic field. If the corresponding checkboxes are selected, the applet will indicate the conventional direction of current (red arrows), the magnetic field lines (blue) and the...

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Direct Current Electrical Motor(Animation)

This Java applet shows a direct current electrical motor which is reduced to the most important parts for clarity. Instead of an armature with many windings and iron nucleus there is only a single rectangular conductor loop; the axis the loop rotates on is omitted. The red arrows indicate the conventional direction of current (from plus to minus). You can recognize the magnetic field lines (directed from the red painted north pole to the green painted south pole) by the blue color. The black arrows represent the Lorentz force which is exerted on...

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Generator(Animation)

This Java applet simulates a generator which is reduced to the most important parts for clarity. Instead of an armature with many windings and iron nucleus there is only a single rectangular conductor loop; the axis the loop rotates on is omitted. The radio buttons in the top right corner allow you to choose an AC generator (without commutator), or a DC generator (with commutator). You can change the direction of rotation by using the corresponding button. The sliding control makes it possible to vary the rotational speed. You can stop and continue...

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Simple AC Circuits(Animation)

Java applet shows a simple circuit consisting of an alternating voltage source and, depending on the selected radio button, a resistor (without inductivity), a capacitor or an ideal coil (without resistance). In addition there are meters for the voltage U (blue) and the amperage I (red). Below the drawing of the circuit you see on the left a phasor diagram; it is possible to read the momentary oscillation phases from the position of the two phasors (voltage blue, amperage red). The projection of a phasor onto the vertical axis corresponds to the...

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Potentiometer(Animation)

In this animation you can change position of the sliding contact.You can observe the changes in output voltages and current. For Animation CLICK H...

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Electromagnetic Oscillating Circuit(Animation)

This simulation deals with an electromagnetic oscillating circuit, consisting of a capacitor (center) and an inductor (i.e. a coil, on the right). As soon as you have pressed the "Reset" button, the plates of the capacitor will be charged, namely the upper plate positively and the lower plate negatively. After clicking on the "Start" button with the mouse, the switch will be brought to its other position so that the oscillation will begin. The same button makes it possible to interrupt respectively resume the simulation. The animation will be 10...

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Electromagnetic Wave(Animation)

This animation shows an electromagnetic wave, namely a plane polarized wave, which propagates in positive x direction. The vectors of the electric field (red) are parallel to the y axis, the vectors of the magnetic field (blue) are parallel to the z axis. For Animation CLICK H...

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Combinations of Resistors, Inductors and Capacitors(Animation)

This animation will give you the idea about  series and parallel connection of resistors and inductors and capacitors.Rightside you can see so many buttons like replace parallel series and all.click on that and observe the changes. For Animation CLICK H...

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Interference of two Circular or Spherical Waves

This Java applet shows the interference of two circular respectively spherical waves (e.g. of water or sound waves). The waves spread out from two sources oscillating with the same phase. For the interference of the waves the principle is valid that the elongations are added, considering their signs. You can observe the following two extreme cases: At those points, where the difference Δs of the path lengths (the difference of the distances from the two sources) is an integer multiple of the wavelength λ, the waves arrive with the same phase: This...

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Beats(Animation)

For Animation CLICK H...

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Simple Pendulum(Animation)

This Java applet demonstrates the variation of elongation, velocity, tangential acceleration, force and energy during the oscillation of a pendulum (assumed with no friction). The "Reset" button brings the body of pendulum to its initial position. You can start or stop and continue the simulation with the other button. If you choose the option "Slow motion", the movement will be ten times slower. The length of the pendulum, the gravitational acceleration, the mass and the amplitude of the oscillation can be changed within certain limits....

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Uniform Circular Motion(Animation)

Circular motion plays an important role in nature and technology. So, the planets move on (approximately) circular orbits around the sun. Other examples are the rotating armature of an electric motor or the crankshaft of a gasoline engine. This Java applet simulates such a circular motion and demonstrates how position, velocity, acceleration and acting force vary in time. The "Reset" button brings the rotating body in its initial position. You can start or stop and continue the simulation with the other button. If you choose the option "Slow motion",...

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Elastic and Inelastic Collision(Animation)

This Java applet deals with the extreme cases of a collision process illustrated by two wagons: For an elastic collision it is characteristic that the sum of the kinetic energies of the involved bodies is constant. After a perfectly inelastic collision, however, both bodies have the same velocity; the sum of their kinetic energies is reduced, compared with the initial value, because a part of it has changed into internal energy (warming up). The total momentum of the involved bodies is conserved, regardless whether the collision is elastic or...

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Projectile Motion(Animation)

This Java applet shows the motion of a projectile. The "Reset" button brings the projectile to its initial position. You can start or stop and continue the simulation with the other button. If you choose the option "Slow motion", the movement will be ten times slower. You can vary (within certain limits) the values of initial height, initial speed, angle of inclination, mass and gravitational acceleration. The radio buttons give the possibility to select one of five physical sizes. The effect of air resistance is neglected. For Animation...

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Resolution of a Force into Components(Animation)

When solving physics problems, it is often helpful to replace one force by a combination of two forces with given directions. Of course, these two forces must be equivalent to the given one. This means that their vector sum must agree with the given force. If this condition is fulfilled, we say that the force has been resolved into components. A simple geometrical construction provides the magnitudes of the components: We can draw two lines from the end of the given force vector parallel to the given directions. In this way, we get the so-called...

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Resultant of Forces(Animation)

This applet deals with forces exerted on a body (assumed as point-sized). You can vary the number of single forces by using the choice box at the ride side. It is possible to change the sizes and directions of these forces (blue arrows) by dragging the arrowheads to the intended positions with pressed mouse button. If you want to know the total force which is exerted on the body, you have to carry out a vector addition. As soon as you have clicked on the button "Find out resultant" the program will show you the necessary parallel translations of...

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Equilibrium of Three Forces

A simple experiment concerning the equilibrium of three forces is simulated here: Weights are suspended from three tied cords. Two of the cords run over frictionless pulleys. The three forces acting on the knot (coloured arrows) are in equilibrium. You can write forces from 1 N to 10 N into the text fields (don't forget to press the "Enter" key!). Notice that each force must be smaller than the sum of the other two forces! It is possible to vary the positions of the two pulleys by dragging the mouse. The parallelogram of the forces which...

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Motion with Constant Acceleration (Animation)

This Java applet shows a car moving with constant acceleration. The green control panel contains text fields where you can vary the values of initial position, initital velocity and acceleration (don't forget to press the "Enter" key!). By using the buttons at the top right you can bring back the car to its initial position or stop and resume the simulation. If you choose the option "Slow motion", the movement will be ten times slower. Three digital clocks indicate the time elapsed since the start. As soon as the car has reached the green...

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Question of the day

The length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time period of the pendulum of increased length is             (A) 11%                                                          ...

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Path of a Positively Charged Spinning Object

This animation will give you the idea about path followed by a positively charged spinning object in magnetic field. For animation Click h...

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The Electric and Magnetic Field generated by an Oscillating Charge(ANIMATION)

The animation will give you the idea about The Electric and Magnetic Field generated by an Oscillating Charge..From the animation it will be more clear  how the electric field and magnetic field are perpendicular to each other.And how exactly they are perpendicular to direction of propagation also. Watch this Its really good. Requirements -Flash player For Animation Click H...

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WHEATSTONE BRIDGE

WHEATSTONE BRIDGEWheatstone bridge is an arrangement of four resistances which can be used to measure one of them in terms of rest. Here arms AB and BC are called ratio arm and arms AC and BD are called conjugate arms.Balanced Wheatstone bridge: The bridge is said to be balanced when deflection in galvanometer is zero i.e. no current flows through the galvanometer or in other words VB = VD. In the balanced condition P/Q = R/S, on mutually changing the position of cell and galvanometer...

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Bulbs in series and parallel for CET aspirants

Combination of BulbsBulbs in Series(i) Total power consumed 1/Ptotal = 1/P1 + 1/P2 +...(ii) If ‘n’ bulbs are identical, Ptotal = P/N (iii) Pconsumed (Brightness) ∝ V ∝ R ∝ 1/Prated i.e. in series combination bulb of lesser wattage will give more bright light and p.d. appeared across it will be more.Bulbs in Parallel(i) Total power consumed            Ptotal = P1 + P2 + P3 +...+ Pn(ii)...

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Heating Effect of Electric Current

Heating Effect of CurrentJoule HeatWhen some potential difference V is applied across a resistance R then the work done by the electric field on charge q to flow through the circuit in time t will be  Joule. This work appears as thermal energy in the resistor.Heat produced by the resistance R is  Cal. This relation is called joules heat.Electric PowerThe rate at which electrical energy is dissipated into other forms of energy is called electric power i.e.Units: It’s S.I....

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Question of the day

    A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque needed to maintain the needle in this position will be             (A) Ö3 W                                                         ...

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