Flux: If a rectangular area is rotated in a uniform electric field from the position where the maximum electric flux goes through it to an orientation where only half the flux goes through it, what has been the angle of rotation?
A) 45°
B) 26.6°
C) 90°
D) 30°
E) 60°

Question

Quizplus · Accepted Answer

The angle of rotation is 60° because electric flux is given by $ \Phi = EA \cos(\theta) $, where $ \Phi $ is the electric flux, $ E $ is the electric field strength, $ A $ is the area, and $ \theta $ is the angle between the field and the normal to the surface. If the flux is halved, $ \cos(\theta) = 0.5 $, which corresponds to $ \theta = 60° $.

Flux: If a Rectangular Area Is Rotated in a Uniform