The current through a choke coil increases from zero to 6 A in 0.3 seconds and an induced emf of 30 V is produced. The inductance of the coil is

1.  5 H

2.  2.5 H

3.  1.5 H

4.  2 H

Subtopic:  Self - Inductance |
 84%
From NCERT
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A rod of length l rotates with uniform angular velocity ω about an axis passing through its one end and perpendicular to its length. If a uniform magnetic field exists perpendicular to the axis of rotation, then induced emf across the two ends of the rod is :

1. 12Bωl2

2. Bωl2

3. 2 Bωl2

4. zero

Subtopic:  Motional emf |
 80%
From NCERT
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Energy stored in an inductor can be made four times when

1. inductance is doubled

2. Current is made 2 times

3. current is doubled

4. can never to be made

Subtopic:  Self - Inductance |
 83%
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The current passing through a choke coil of 5 H is decreasing at the rate of 3 As-1. The emf induced in the coil is 

1. 15 V

2. -15 V

3. 53V

4. -53V

Subtopic:  Self - Inductance |
 56%
From NCERT
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If all linear dimensions of an inductor are tripled, then self-inductance will become (keeping the total number of turns per unit length constant)

1.  3 times

2.  9 times

3.  27 times

4. 1/3 times

Subtopic:  Self - Inductance |
From NCERT
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A coil of resistance 20Ω and inductance 5H has been connected to a 200 V battery. The maximum energy stored in the coil is

(1) 250 J

(2) 125 J

(3) 500 J

(4) 100 J

Subtopic:  Self - Inductance |
 80%
From NCERT
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A small square loop of wire of side l is placed inside a large square of wire of side L (L>>l). The loops are co-planar and their centres coincide. The mutual inductance of the system is proportional to :

1. l/L

2. l2/L

3. L/l

4. L2/l

 

Subtopic:  Mutual Inductance |
 69%
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The key K is inserted at time t= 0. The initial (t=0) and final t currents through the battery are:
                               

1. \(\frac{1}{15}~A,~\frac{1}{10}~A\)
2. \(\frac{1}{10}~A,~\frac{1}{15}~A\)
3. \(\frac{2}{15}~A,~\frac{1}{10}~A\)
4. \(\frac{1}{15}~A,~\frac{2}{25}~A\)

Subtopic:  LR circuit |
 70%
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Two coils have a mutual inductance of 5 mH. Current changes in the first coil according to the equation I = I0cos wt, where I0 = 10 A and ω = 100π rad/s. Maximum value of e.m.f. induced in the second coil is

1.  5π volt

2.   2π volt

3.  4π volt

4.  π volt

Subtopic:  Mutual Inductance |
 79%
From NCERT
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Lenz's law is a consequence of the law of conservation of 

(1) Charge

(2) Momentum

(3) Mass

(4) Energy

Subtopic:  Faraday's Law & Lenz Law |
 77%
From NCERT
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