Physics-
General
Easy
Question
A conducting ring of radius a is rotated about a point O on its periphery as shown in the figure in a plane perpendicular to uniform magnetic field B which exists everywhere. The rotational velocity is 
.
Choose the correct statement(s) related to the magnitude of potential differences
The correct answer is:
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A conducting rod PQ of length L = 1.0 m is moving with a uniform speed v = 20 m/s in a uniform magnetic field B = 4.0 T directed into the paper. A capacitor of capacity C = 10 
is connected as shown in figure. Then
A conducting rod PQ of length L = 1.0 m is moving with a uniform speed v = 20 m/s in a uniform magnetic field B = 4.0 T directed into the paper. A capacitor of capacity C = 10 is connected as shown in figure. Then
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In the previous question, if B is normal to the plane of the rails
In the previous question, if B is normal to the plane of the rails
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AB and CD are smooth parallel rails, separated by a distance l, and inclined to the horizontal at an angle 
. A uniform magnetic field of magnitude B, directed vertically upwards, exists in the region. EF is a conductor of mass m, carrying a current i. For EF to be in equilibrium,
AB and CD are smooth parallel rails, separated by a distance l, and inclined to the horizontal at an angle . A uniform magnetic field of magnitude B, directed vertically upwards, exists in the region. EF is a conductor of mass m, carrying a current i. For EF to be in equilibrium,
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Two circular coils A and B are facing each other as shown in figure. The current i through A can be altered
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A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced currents in wires AB and CD are
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physics-General
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The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
If I1 and I2 are the magnitudes of induced current in the cases I and II, respectively, then
The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
If I1 and I2 are the magnitudes of induced current in the cases I and II, respectively, then
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The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
The direction of induced current in the case II is
The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
The direction of induced current in the case II is
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The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
The direction of induced current in the case I is
The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
The direction of induced current in the case I is
physics-General
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The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
The value of magnetic flux in each case is given by
The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field B.
The value of magnetic flux in each case is given by
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The circuit shown is in a uniform magnetic field that is into the page and is decreasing in magnitude at the rate of 150 tesla/second. The ideal ammeter reads
The circuit shown is in a uniform magnetic field that is into the page and is decreasing in magnitude at the rate of 150 tesla/second. The ideal ammeter reads
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In the shown AC circuit phase different between currents I1 and I2 is
In the shown AC circuit phase different between currents I1 and I2 is
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The current I, potential difference VL across the inductor and potential difference VC across the capacitor in circuit as shown in the figure are best represented vectorially as
The current I, potential difference VL across the inductor and potential difference VC across the capacitor in circuit as shown in the figure are best represented vectorially as
physics-General
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If I1, I2, I3 and I4 are the respective r.m.s. values of the time varying currents as shown in the four cases I, II, III and IV. Then identify the correct relations.
If I1, I2, I3 and I4 are the respective r.m.s. values of the time varying currents as shown in the four cases I, II, III and IV. Then identify the correct relations.
physics-General
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In the circuit diagram shown, XC = 100 
, XL = 200 and R = 100 . The effective current through the source is
In the circuit diagram shown, XC = 100 , XL = 200 and R = 100 . The effective current through the source is
physics-General
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The direct current which would give the same heating effect in an equal constant resistance as the current shown in figure, i.e. the r.m.s. current, is
The direct current which would give the same heating effect in an equal constant resistance as the current shown in figure, i.e. the r.m.s. current, is
physics-General
