A cylindrical region contains a uniform electric field that is parallel to the axis and is changing with time.If r is the distance from the cylinder axis the magnitude of the magnetic field outside the region is:

Question

Quizplus · Accepted Answer

According to Faraday's law of electromagnetic induction, a changing electric field induces a magnetic field. Outside the cylindrical region, the magnetic field is inversely proportional to the distance from the axis, hence proportional to 1/r.

A Cylindrical Region Contains a Uniform Electric Field That Is