Q. No.
A long solenoid has 1000 turns. When a current of 4A flows through it, the magnetic flux linked with each turn of the solenoid is 4 x 10-3 Wb. The self-inductance of the solenoid is:
1. 3H
2. 2H
3. 1H
4. 4H
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Which one of the following is the correct variation of voltage with time in the coil?
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The key K is inserted at time t= 0. The initial (t=0) and final currents through battery are :
1.
2.
3.
4.
A current-carrying wire is placed below a coil in its plane, with current flowing as shown.
If the current increases –
1. no current will be induced in the coil
2. an anticlockwise current will be induced in the coil
3. a clockwise current will be induced in the coil
4. the current induced in the coil will be first anticlockwise and then clockwise
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Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in webers is
(1) 2
(2) 4
(3) 6
(4) None of these
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When the current in a certain inductor coil is 5.0 A and is increasing at the rate of 10.0 A/s, the potential difference across the coil is 140V. When the current is 5.0 A and decreasing at the rate of 10.0 A/s, the potential difference is 60V. The self-inductance of the coil is –
1. 2H
2. 4H
3. 8H
4. 12H
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An electric potential difference will be induced between the ends of the conductor shown in the diagram when the conductor moves in the direction of:
1. \(P\)
2. \(Q\)
3. \(L\)
4. \(M\)
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A conducting rod PQ of length L = 1.0 m is moving with a uniform speed v = 2 m/s in a uniform magnetic field B = 4.0 T directed into the paper. A capacitor of capacity C = 10 μF is connected as shown in figure. Then
(1) qA = + 80 μC and qB = – 80 μC
(2) qA = – 80 μC and qB = + 80 μC
(3) qA = 0 = qB
(4) Charge stored in the capacitor increases exponentially with time
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The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first
(1) b > (d = e) < (a = c)
(2) b > (d = e) > (a = c)
(3) b < d < e < c < a
(4) b > (a = c) > (d = e)
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A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would be –
1. halved
2. the same
3. doubled
4. quadrupled
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