#14 | Mutual Induction
(Physics) > Electromagnetic Induction
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Related Practice Questions :

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

 

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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

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Two coils of self inductance L1 and L2 are placed closer to each other so that total flux in one coil is completely linked with other. If M is mutual inductance between them, then 

(1) M = L1 L2

(2) M = L1/L2

(3) M=L1L2

(4) M = (L1 L2)2

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Two circuits have coefficient of mutual induction of 0.09 henry. Average e.m.f. induced in the secondary by a change of current from 0 to 20 ampere in 0.006 second in the primary will be 

(1) 120 V

(2) 80 V

(3) 200 V

(4) 300 V

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A loss free transformer has 500 turns on its primary winding and 2500 in secondary. The meters of the secondary indicate 200 volts at 8 amperes under these conditions. The voltage and current in the primary is 

(1) 100 V, 16 A

(2) 40 V, 40 A

(3) 160 V, 10 A

(4) 80 V, 20 A

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