1. Two point charges are separated by 6 cm. The attractive force between them is 20 N. Show that the force between them when they are separated by 12 cm is 5 N. 2. A droplet of ink in an industrial...

1. Two point charges are separated by 6 cm. The attractive force between them is 20 N. Show that the force between them when they are separated by 12 cm is 5 N.

2. A droplet of ink in an industrial ink-jet printer carries a charge of
 C and is deflected onto paper by a force of
 N. Show that the strength of the electric field that is required to produce this force is
 N>C.