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

Multiple Choice

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 length of the solenoid becomes twice as long (to 2L) ,but all other quantities remained 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.