By what factor is the self-inductance of a solenoid changed if only its number of coil turns,N,is doubled?
A) 8
B) 1/2
C) 4
D) 2

Question

Quizplus · Accepted Answer

The self-inductance of a solenoid is directly proportional to the square of the number of coil turns (N^2). Therefore, if the number of coil turns is doubled (N becomes 2N), the self-inductance will be increased by a factor of 4 ((2N)^2/N^2 = 4). Therefore, the correct choice is C.

By What Factor Is the Self-Inductance of a Solenoid Changed