Question

The diagram above shows an isolated, positive charge Q. Point (B) is twice as far away from Q as point A. The ratio of the electric field strength at point A to the electric field strength at point B is

(A) 8 to 1 

(B) 4 to 1 

(C) 2 to 1 

(D) 1 to 1 

(E) 1 to 2

Answer 1

The correct option is: (B) 4 to 1

Explanation:

E ∝ 1/r² so if r × 2, E ÷ 4