Inez uses hairspray on her hair each morning before going to school. The spray spreads out before reaching her hair partly because of the electrostatic charged on the hairspray droplets. If the two drops of hairspray repel each other with a force of 9.0 x 10 (exponent -9)Newtons at a distance of 0.070cm, what is the charge on each of the equally charged drops of hairspray?

Explanation:

The magnitude of the electrostatic force between two charged objects is

where

k is the Coulomb's constant

q1 and q2 are the two charges

r is the separation between the two charges

The force is attractive if the charges have opposite sign and repulsive if the charges have same sign.

In this problem, we have:

is the distance between the charges

since the charges are identical

is the force between the charges

Re-arranging the equation and solving for q, we find the charge on each drop:

the answer for apex is the lowest

v=ir = 3x15 =45 v