Question

force between two charges ​

Answer 1

Coulomb's law, or Coulomb's inverse-square law, is an experimental law of physics that quantifies the amount of force between two stationary, electrically charged particles. The electric force between charged bodies at rest is conventionally called electrostatic force or Coulomb force. Wikipedia

Answer 2

you can first find force between Fab and then Fac using this formula

$f = 9 \times {10}^{9} \times \frac{q1q2}{ {r}^{2} }$

and after finding individual force you can find net force by this relationship

$f = \sqrt{ {fab}^{2} + {fac}^{2} + 2 \times fab \times fac \cos( \alpha ) }$

$where \alpha is \: angle \: between \: them$

$and \alpha = 60(because \: it \: is \: equilatrail \: triangle)$

I have another work so can't solve it deeply

$<marquee><font color="purple">♥ mark as brilliant ♥ </marquee>$