Answer to Question #315735 in Electric Circuits for Anne

Question

two (2) nickel coins with identical charges are separated by 1.5 m. If the forces exerted by the coins to one another are both 2N, what is the charge on ech coin?

Answer 1

We know that

$F=\frac{kq_1q_2}{r^2}$

$F=\frac{kq^2}{r^2}$

$q=\sqrt{\frac{Fr^2}{k}}$

$$q_1=q_2=q=\sqrt{\frac{2\times 1.5^2}{9\times10^9}}=22.36\times10^{-6}C$$