Three point charges, two positive and one negative, each having a magnitude of 10.0 µC, are placed at the vertices of an equilateral triangle that is 50.0 cm on a side. What is the magnitude of the electrostatic force on the negative charge?
A)3.1 N
B)3.6 N
C)6.2 N
D)7.2 N

Question

Quizplus · Accepted Answer

The electrostatic force between two charges is given by Coulomb's law. The forces due to the two positive charges on the negative charge are equal in magnitude and at 60 degrees to each other. The net force is the vector sum of these two forces, which can be calculated using trigonometry.

Three Point Charges, Two Positive and One Negative, Each Having