Question

Two balloons having the same charge of 1.2 × 10-6 coulombs each are kept 5.0 × 10-1 meters apart. What is the magnitude of the repulsive force between them? (k = 9.0 × 109 newton·meter2/coulombs2)

Answer 1

here we have to apply the \(Coulomb\) law, so the requested force has the subsequent magnitude \(F\):
\[F = K\frac{{{Q^2}}}{{{d^2}}}\]
where \(Q\) is the common charge and \(d\) is the separation distance between the balloons. Of course \(K=9 \cdot 10^9\)