phyics question below

Question

A small cork with an excess charge of +7.0 µC
is placed 0.24 m from another cork, which
carries a charge of −3.2 µC.
What is the magnitude of the electric force
between the corks? The Coulomb constant is
8.98755 × 109 N · m2
/C
2
.
Answer in units of N

Answer 1

For magnitude, ignore the signs of the charges.

 

F = k q1 q2 / r12^2 = (8.98755 x 10^9) (7 x 10^-6) (3.2 x 10^-6) / (0.24)^2 N = 3.495 N