A coil is rotated in a magnetic field about an axis perpendicular to both the field and the coil axis (normal to the coil area). During each rotation, how many times does the flux through the coil equal zero?
A) 0
B) 1
C) 2
D) 4
E) more than 4

Question

Quizplus · Accepted Answer

The flux through the coil equals zero twice during each rotation. This occurs when the plane of the coil is parallel to the magnetic field lines, allowing no field lines to pass through the coil. This situation happens twice in a full 360-degree rotation.

A Coil Is Rotated in a Magnetic Field About an Axis