Question

The self inductance of a coil is 5 henry, a current of 1 amp change to 2 amp within 5 second through the coil. The value of induced e.m.f. will be

• A. 10 volt
• B. 0.10 volt
• C. 1.0 volt
• D. 100 volt

Answer 1

Answer: (C)

1.0 volt

Answer 2

$e = - L\frac{di}{dt} \Rightarrow e = 5 \times \frac{1}{5} = 1\mspace{6mu} volt$