Question

2 charges, 14.34 µC each, are located at two vertices B & C of an equilateral triangle ABC with sides 2 cm each. Another charge q is located at point A. Calculate q in micro Coulomb so that net POTENTIAL at the mid point of BC will be ZERO.

Answer 1

The potential difference due to a charged particle of charge 'q' at a distance 'r' is given by equation (1).

So, the potential at the midpoint of BC due to the charges at B and C is

Similarly,

If the net potential at D is zero, we can write

or,

or,

or,