A charge moving in a straight line enters a uniform electric or magnetic field.If the motion of this charge is not affected,this field could only have been a magnetic field,not an electric field.

Question

Quizplus · Accepted Answer

A charge moving in a straight line is not affected by a magnetic field, but is affected by an electric field. Therefore, if the motion of the charge is not affected, it must be because the field is a magnetic field, not an electric field.

A Charge Moving in a Straight Line Enters a Uniform