Assume that in interstellar space the distance

between two electrons is about 0.68 cm.
The electric force between the two electrons
is
1. attractive.
2. repulsive.

Calculate the electric force between these two
electrons. The value of the Coulomb constant
9 × 109 N · m2
/C
2
and the elemental charge is
1.6 × 10−19 C .
Answer in units of N.