Consider a solenoid of length L,N windings,and radius b (L is much longer than b).A current I is flowing through the wire.If the radius of the solenoid were doubled (becoming 2b),and all other quantities remained the same,the magnetic field inside the solenoid would
A) remain the same.
B) become twice as strong.
C) become one half as strong.

Question

Quizplus · Accepted Answer

The magnetic field inside a long solenoid is given by the formula B = μ₀(NI/L), where μ₀ is the permeability of free space, N is the number of turns, I is the current, and L is the length of the solenoid. This formula shows that the magnetic field inside a solenoid depends on the number of turns per unit length and the current, but not on the radius of the solenoid. Therefore, doubling the radius while keeping all other factors constant does not change the magnetic field strength inside the solenoid.

Consider a Solenoid of Length L,N Windings,and Radius B (L