The electric field at point P due to a point charge Q a distance R away has magnitude E.In order to double the magnitude of the field at P,you could
A)double the charge to 2Q.
B)double the distance to 2R.
C)reduce the distance to R/2.
D)reduce the distance to R/4.
E)double the charge to 2Q and at the same time reduce the distance to R/2.

Question

Quizplus · Accepted Answer

E  The electric field due to a point charge is given by E = kQ/R^2. To double the field, you can either double the charge (A) or reduce the distance to R/√2 (not an option here). Reducing the distance to R/2 (C) would quadruple the field, and reducing it to R/4 (D) would increase it by a factor of 16. Option E would increase the field by a factor of 8.

The Electric Field at Point P Due to a Point