When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
A) triple.
B) double.
C) be reduced by a factor of one-fourth.
D) quadruple.
E) be reduced by a factor of one-half.

Question

Quizplus · Accepted Answer

The magnetic field inside an ideal solenoid is directly proportional to the number of turns per unit length. Doubling the number of windings doubles the turns per unit length, thus doubling the magnetic field.

When You Double the Number of Windings in an Ideal