What is the force, in terms of Coulomb's constant, between two electrical charges of #-4 C# and #7 C# that are #2 m # apart?

1 Answer
Dec 27, 2017

The force is #=-7k_cN#

Explanation:

The net force is

#F=k(q_1*q_2)/r^2#

The charge #q_1=-4C#

The charge #q_2=7C#

The distance #r=2m#

The Coulomb constant is #k_c=9*10^9Nm^2C^-2#

Therefore,

# F= k_c (((-4) *(7)) / (2)^2) #

#=-7k_cN#

The #-# sign indicates that the force is attractive.