Consider an ideal solenoid of length L,N windings,and radius b (L is much longer than b).A current I is flowing through the wire windings.If the radius of the solenoid is doubled to 2b,but all the other quantities remain the same,the magnetic field inside the solenoid will
A)remain the same.
B)become twice as strong as initially.
C)become one-half as strong as initially.
D)become four times as strong as initially.
E)become one-fourth as strong as initially.

Question

Quizplus · Accepted Answer

The magnetic field inside an ideal solenoid only depends on the number of windings per unit length and the current flowing through the wire, not the radius of the solenoid. Therefore, if the radius is doubled but all other quantities remain the same, the magnetic field inside the solenoid will remain the same.

Consider an Ideal Solenoid of Length L,N Windings,and Radius B