A charge Q accumulates on the hollow metallic dome,of radius R,of a Van de Graaff generator.A probe measures the electric field strength at various points outside the sphere surface.If the probe is initially at a distance 3R from the sphere's center and then is moved to 4R,by what factor will the electric field reading change?

Question

Quizplus · Accepted Answer

The electric field outside a charged sphere is inversely proportional to the square of the distance from the center. Moving from 3R to 4R, the field changes by a factor of (3/4)^2.

A Charge Q Accumulates on the Hollow Metallic Dome,of Radius