What is the dimensional formula of magnetic flux?

1. [M L2 T-2 A-1]

2. [M L1 T-1 A-2]

3. [M L2 T-3 A-1]

4. [M L-2 T-2 A-2]

Subtopic:  Magnetic Flux |
 72%
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A cylindrical magnet is kept along the axis of a circular coil. On rotating the magnet about its axis, the coil will have induced in it:

1. No current
2.  A current
3.  Only an e.m.f.
4. Both an e.m.f. and a current

Subtopic:  Motional emf |
 58%
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The magnetic flux through a coil varies with time t as shown in the diagram. Which graph best represents the variation of the e.m.f. E induced in the coil with time t?

1. 2.
3. 4.
Subtopic:  Faraday's Law & Lenz Law |
 68%
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A bar magnet is made to fall through a long surface copper tube. The speed (v) of the magnet as a function of time (t) is best represented by:

1. a 2. b
3. c 4. d
Subtopic:  Faraday's Law & Lenz Law |
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When a conducting wire XY is moved towards the right, a current flows in the anti-clockwise direction. Direction of magnetic field at point O is:

1.  parallel to the motion of wire.
2.  along with XY.
3.  perpendicular outside the paper.
4.  perpendicular inside the paper.
Subtopic:  Motional emf |
 72%
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The magnetic energy stored in a long solenoid of an area of cross-section A in a small region of length L is:

1. B2AL2μ02

2. AL2μ0

3. 12μ0B2AL

4. B2AL2μ0

Subtopic:  Self - Inductance |
 65%
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An inductor is connected to a direct voltage source through a switch. Then:

1. a very large emf is induced in inductor when the switch is closed.
2. a large emf is induced when the switch is opened.
3. a large emf is induced whether the switch is closed or opened.
4. no emf is induced whether the switch is closed or opened.
Subtopic:  LR circuit |
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A long solenoid has self-inductance L. If its length is doubled keeping total number of turns constant, then its new self-inductance will be:

1. L2

2. 2L

3. L

4. L4

Subtopic:  Self - Inductance |
 62%
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With the decrease of current in the primary coil from 2 A to zero in 0.01 s, the e.m.f. generated in the secondary coil is \(1000~\mathrm{V}\). The mutual inductance of the two coils is:

1. 1.25 H

2. 2.50 H

3. 5.00 H

4. 10.00 H

Subtopic:  Mutual Inductance |
 88%
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Two coaxial coils are very close to each other and their mutual inductance is 5 mH. If a current 50 sin 500t is passed in one of the coils, then the peak value of induced e.m.f. in the secondary coil will be:

1. 5000 V 2. 500 V
3. 150 V 4. 125 V
Subtopic:  Mutual Inductance |
 75%
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