Question

A charge Q creates an electric field. At a distance of 10 cm, the electric field strength
is 30 N/C. What is the electric field strength at a distance of 20 cm? NO LINKS.

1) 7.5 N/C
2) 15 N/C
3) 60 N/C
4) 120 N/C

Answer 1

Answer:

simltinoues divide two eqn El÷E2 Kq\ r^2\kq \2r^2 then you get it 7.5 N\c the answer is A