Answer to Question #298366 in Electricity and Magnetism for samantha

Question

Two small spheres spaced apart have equal charge. How many electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 N?

Answer 1

Answer

No. Of electrons must be present on each sphere

$n=\sqrt{\frac{Fr^2}{ke^2}}$

Take value of separation between them is r=1m

$n=\sqrt{\frac{4.57*10^{-21}*1^2}{9*10^9*1.6*1.6*10^{-38}}}\\n=4450$