Answer to Question #343178 in Physics for minseok

Question

Find the charge of a point charge q if its electric field E has 12.1 N/C and a distance of 1.8m

Answer 1

$$E=k\frac{q}{r^2}$$

$$q=Er^2/k\\ =12.1*1.8^2/9*10^9=4.4*10^{-9}\:\rm C$$