An isolated charged point particle produces an electric field with magnitude E at a point 2 m away.At a point 1 m from the particle the magnitude of the field is:
A)E
B)2E
C)4E
D)E/2
E)E/4

Question

Quizplus · Accepted Answer

The electric field E due to a point charge varies inversely with the square of the distance from the charge. If the field is E at 2 m, at 1 m (half the distance), it will be (2^2) times stronger, hence 4E.

An Isolated Charged Point Particle Produces an Electric Field with Magnitude