What is the force, in terms of Coulomb's constant, between two electrical charges of 2C and 2C that are 3m apart?

1 Answer
Jun 18, 2016

F=49K.

Explanation:

The Coulomb's force is given by

F=KQ1Q2r2

where K is the Coulomb's constant, Q are the charges and r the distance.

With your numbers we have

F=K2232=49K.

Because you ask to keep it in units of the Coulomb constant, I will not continue the calculation evaluating K.
The negative sign tell us that the force is attractive because the two charges have opposite sign.