Two charged small spheres are a distance r apart and exert an electrostatic force f on each other. if the distance is halved to r/5 , the force exerted on each sphere will be..
a) 25f
b) 5f
c) f/5
d) f/25

a) 25F

Explanation:

Assuming that the two small spheres can be modeled as point charges, according to Coulomb's law, the magnitude of the electrostatic force is given by:

In this case, we have :

volts times amps 6 x 0.5 3w