Question

Two identical charges repel each other with a force of 10-5 N when they are 20 cm apart.

a.) What is the force on each when they are 5 cm apart?
b.) When they are 100 cm apart?

Answer 1

1/4 the distance? must be 16 times as great.
4 times as far? must be 1/16 as much

F=kQq/distance^2

Answer 2

25

300

Answer 3

Assessment