When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
A) 0.25
B) 0.50
C) 1
D) 2
E) 4

Question

Quizplus · Accepted Answer

The magnetic field inside a solenoid is directly proportional to the number of turns per unit length (n = N/L). Doubling both the number of turns (N) and the length (L) keeps the turns per unit length (n) constant, so the magnetic field remains unchanged.

When the Number of Turns in a Solenoid and Its