Question

Point P and point charge Q are separated by a distance R. The electric field at point P has magnitude E. How could the magnitude of the electric field at point P be doubled to 2E?

Answer 1

Point P and point charge Q are separated by a distance R. The electric field at point P has magnitude E. How could the magnitude of the electric field at point P be doubled to 2E?

A) double the point charge to 2Q
B) double the distance to 2R
C) reduce the distance to R/4
D) reduce the distance to R/2
E) reduce the point charge to Q/2

Answer 2

The electric field at a point is given by\[E=\frac{ q }{ 4\pi \epsilon_{0} r ^{2} }\] Hence to double the electric field you need only double the charge q :)