Question $1$

Using pendulum to measure the pair of forces between two positive charges

Weight of a bulb $=40$ Newton

Tension vector angle$=30$ degrees

Find the electric force between the charged bulbs

Use the given ratio diagram of a $30-$deg, $60-$deg, and $90-$deg triangle.

Question$2$

Let q$1=15$ Coulomb, q$2=2$ coulomb, r $=6$ meters, r$/$c$=6/3$E$8=2$E$-8$ second$=20$ nanosecond,

acceleration of q$1($t $=20$ nanosecond ago$)=1\mathrm{.}5$ m$/$s$/$s$,$ q$2$ stationary

Using F$($t$)$ on q$2$ now $=-$ k$*$q$1*$q$2*$acceleration of q$1($some time ago$)/($c$*$c$*$r$)$Find F $($now at q$2)$