Question

A battery of e.m.f. E is applied to a coil of resistance 5 ohm and inductance 12 H through a switch. The operating time of the switch is 1 ms. When the switch was opened the induced e.m.ſ. was found to be 18000 V in the circuit. The applied e.m.f. E is
1) 200 V
2) 7.5 V
3) 0.75 V
4) 75 V​

Answer 1

Answer:

option 1 :200 vnnthis the answer