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Q.

The average emf induced in a coil in which the current changes from 2 A to 4 A in 0.05 second is 8 volts. The self-inductance of the coil is

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a

0.1 H 

b

0.8 H 

c

0.2 H

d

0.4 H  

answer is B.

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Detailed Solution

emf = L(di/dt)

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