When the current in a coil changes from 2 amp. to 4 amp. in 0.05 sec., an e.m.f. of 8 volt is induced in the coil. The coefficient of self inductance of the coil is
A. 0.1 henry
B. 0.2 henry
C. 0.4 henr
D. 0.8 henry
Answer:B
When the current in a coil changes from 2 amp. to 4 amp. in 0.05 sec., an e.m.f. of 8 volt is induced in the coil. The coefficient of self inductance of the coil is
A. 0.1 henry B. 0.2 henry C. 0.4 henr D. 0.8 henry