Q. No.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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Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be
(1) Maximum in situation (A)
(2) Maximum in situation (B)
(3) Maximum in situation (C)
(4) The same in all situations
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An aluminum ring B faces an electromagnet A. The current I through A can be altered. Then :
(1) Whether I increases or decreases, B will not experience any force
(2) If I decrease, A will repel B
(3) If I increases, A will attract B
(4) If I increases, A will repel B
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Figure shows three regions of magnetic field, each of area A, and in each region magnitude of magnetic field decreases at a constant rate .
If is induced electric field then value of line integral along the given loop is equal to
1.
2.
3.
4.
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