Question

A solenoid of 10 henry inductance and 2 ohm
resistance, is connected to a 10 volt battery. In how
much time the magnetic energy will be reaches to
1/4 th of the maximum value?
(1) 3.5 sec
(2) 2.5 sec
(3) 5.5 sec
(4) 7.5 sec​

Answer 1

Answer:

5.5. seconds..........