Solenoid 2 has twice the radius and six times the number of turns per unit length as solenoid 1. The ratio of the magnetic field in the interior of 2 to that in the interior of 1 is:
A) 2
B) 4
C) 6
D) 1
E) 1/3

Question

Quizplus · Accepted Answer

The magnetic field inside a solenoid is proportional to the number of turns per unit length. Since solenoid 2 has six times the number of turns per unit length as solenoid 1, the magnetic field inside solenoid 2 is six times that inside solenoid 1. The radius does not affect the magnetic field inside an ideal solenoid.

Solenoid 2 Has Twice the Radius and Six Times the Number