Physics-
General
Easy
Question
For the circuit shown in the figure, potential difference VB – VA is
- 4V
- – 4V
- 12V
- -12V
The correct answer is: 4V
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Five cells of emf’s 1V, 2V, 3V, 2V and 1V and having internal resistances 1,2,3,2 and 1 ohm respectively are connected as shown in figure
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Figure shows a bar magnet and a long straight wire W, carrying current into the plane of paper. Point P is the point of intersection of axis of magnet and the line of shortest distance between magnet and the wire. If P is the midpoint of the magnet, then which of the following statements is correct?
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An electric current i1 can flow either direction through loop (1) and induced current i2 in loop (2). Positive i1 is when current is from 'a' to 'b' in loop (1) and positive i2 is when the current is from 'c' to 'd' in loop (2) In an experiment, the graph of i2 against time 't' is as shown below
Which one(s) of the following graphs could have caused i2 to behave as give above.
An electric current i1 can flow either direction through loop (1) and induced current i2 in loop (2). Positive i1 is when current is from 'a' to 'b' in loop (1) and positive i2 is when the current is from 'c' to 'd' in loop (2) In an experiment, the graph of i2 against time 't' is as shown below
Which one(s) of the following graphs could have caused i2 to behave as give above.
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In the arrangement shown in given figure current from A to B is increasing in magnitude. Induced current in the loop will
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A long straight conductor is placed along axis of a circular coil of radius R. If the current, as shown in figure, starts decreasing with time, the current induced in loop would be
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A vertical bar magnet is dropped from position on the axis of a fixed metallic coil as shown in fig - I. In fig - II the magnet is fixed and horizontal coil is dropped. The acceleration of the magnet and coil are a1 and a2 respectively then
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A square coil ABCD is placed in x-y plane with its centre at origin. A long straight wire, passing through origin, carries a current in negative z-direction. Current in this wire increases with time. The induced current in the coil is
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physics-General
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A wire as a parabola 
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A long straight wire is parallel to one edge as in fig. If the current in the long wire is varies in time as 
, what will be the induced emf in the loop?
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A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 20T. A 10 V light bulb is in a series with the loop as shown in the fig. The magnetic field is decreasing steadily to zero over a time interval 
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A wire loop is placed in a region of time varying magnetic field which is oriented orthogonally to the plane of the loop as shown in the figure. The graph shows the magnetic field variation as the function of time. Assume the positive emf is the one which drives a current in the clockwise direction and seen by the observer in the direction of B. Which of the following graphs best represents the induced emf as a function of time.
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a conducting loop of radius R is present in a uniform magnetic field B perpendicular the plane of the ring. If radius R varies as a function of time ‘t’, as R = R0+ t. The e.m.f induced in the loop is
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A metal ball of radius R is placed concentrically inside a hollow metal sphere of inner radius 2R and outer radius 3R. The ball is given a charge +2Q and the hollow sphere a total charge – Q. The electrostatic potential energy of this system is :
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Force on charge q is
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