What is the force, in terms of Coulomb's constant, between two electrical charges of #7 C# and #-9 C# that are #9 m # apart?

1 Answer
Mar 17, 2017

Answer:

The force is #=-7*10^9 N#

Explanation:

Two charged objects, of charge #q_1 #and #q_2# separated by a
distance r, exert a force on one another.

The magnitude of this force is given by, Coulomb's Law :

#F=k(q_1q_2)/r^2#

where k is a constant:

#k=9*10^9NmC^-2#

The direction of the force is toward the second object if the
objects have opposite signs, and away from the second
object if the signs are the same.

Here,

#q_1=7C#

#q_2=-9C#

#r=9m#

#F=(9*10^9*7*(-9))/9^2#

#=-7*10^9 N#