Electric potential between two point charges

[drawar]

Homework Statement

Two point charges are separated by a distance r. If the separation is reduced by a factor of 3/2, by what factor does the electric potential between them change?
A. 3/2
B. 2/3
C. 9/4
D. 4/9
E. Sqrt(3/2)

Homework Equations

The Attempt at a Solution

Honestly I couldn't think of any formula involving separation of 2 point charges and the electric potential between them. Reading a little more on electric potential, I find that U=Ed but then I'm not sure whether the strength of the electric field remain constant when we change the distance between two point charges.

 

[tiny-tim]

hi drawar!

Honestly I couldn't think of any formula involving separation of 2 point charges and the electric potential between them.

coulomb's law?

 

[drawar]

hi drawar!


coulomb's law?

Hi there!
I've just gone over it and still can't figure it out. Does the Coulomb's Law have anything to do with the electric potential?

 

[tiny-tim]

indirectly …

can't you find the potential from the field? ​