A conducting rod AC of length 4l is rotated about point O in a uniform magnetic field B directed into the paper. If AO = l and OC = 3l, then:

   

1. VAVO=Bωl22
2. VOVC=72Bωl2
3. VAVC=4Bωl2
4. VCVO=92Bωl2

Subtopic:  Motional emf |
 58%
From NCERT
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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. \(b > (a = c) > (d = e)\)

Subtopic:  Faraday's Law & Lenz Law |
 59%
From NCERT
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A square loop of side 5 cm enters a magnetic field with 1 cms-1. If the front edge enters the magnetic field at t = 0, then which graph best depicts emf?

1.  2.
3. 4.

Subtopic:  Motional emf |
 59%
From NCERT
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A coil having number of turns N and cross-sectional area A is rotated in a uniform magnetic field B with an angular velocity ω. The maximum value of the emf induced in it is:

1. NBAω                             

2. NBAω

3. NBAω2                             

4. NBAω2

Subtopic:  Faraday's Law & Lenz Law |
 88%
From NCERT
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A long solenoid has 1000 turns. When a current of 4 A 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. 3 H

2. 2 H

3. 1 H

4. 4 H

Subtopic:  Self - Inductance |
 88%
From NCERT
NEET - 2016
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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

1. Twice per revolution 2. Four times per revolution
3. Six times per revolution 4. Once per revolution
Subtopic:  Faraday's Law & Lenz Law |
 73%
From NCERT
AIPMT - 2013
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A coil has 500 turns and the flux through the coil is \(\phi=3t^{2} +4t+9\) milliweber. The magnitude of induced emf between the ends of the coil at t = 5 s is:

1. 34 millivolt

2. 17 volt

3. 17 millivolt

4. 34 volt

Subtopic:  Faraday's Law & Lenz Law |
 62%
From NCERT
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The current I in an inductance coil varies with time t according to the graph shown in the figure. Which one of the following plots shows the variation of voltage in the coil with time?

1.  2.
3. 4.
 

Subtopic:  Self - Inductance |
 80%
From NCERT
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A bar magnet is released along the vertical axis of the conducting coil. The acceleration of the bar magnet is:

1. greater than g. 2. less than g.
3. equal to g. 4. zero.
Subtopic:  Faraday's Law & Lenz Law |
 85%
From NCERT
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Work done in increasing the current through a solenoid from 0 to 2 A is 20 J. Work done in increasing the current from 4 A to 6 A is:

1. 100 J 2. 60 J
3. 80 J 4. 120 J
Subtopic:  Self - Inductance |
 63%
From NCERT
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