Question

what will happen to yhe long solenoid if length is doubled by stretching?​

Answer 1

Answer:

if A , l are constant terms then, inductance is directly proportional to square of number of turns. now, according to question, ... so, inductance of coil becomes four times. hence, when the number of turns in a coil is doubled without any change in the length of the coil , its self inductance becomes four times.