Ball and string

A ball, which we can treat as a point charge, has a charge of $+Q.$ This ball is $50cm$ away from a ball of

charge $-10Q,$ which is fixed in position. The $+Q$ ball is $30cm$ vertically below, and $40cm$ horizontally, $f$

the other ball, and the $+Q$ ball is held in equilibrium at that position by a string which happens to be

perfectly horizontal.

Note that you should be able to do parts $($a$)$ and $($b$),$ at least, without a calculator. HINT: draw a free$-$t

diagram.

Part $($a$)$

Homework $*$ Answered $*$ Due Jan $30$th$,12$:$15$ PM

The weight of the ball on the string is $18\mathrm{.}0N.$ Determine the magnitude of the electrostatic force that the ball with the charge of

$-10Q$ exerts on the ball with the charge of $+Q.$

N