2.2) A regular hexagon of side 10 cm has a charge at each of its vertices. Calculate the potential at the centre of the hexagon.
The electric potential at O due to one charge,
q = 5 × 10-6 C
r = distance between charge and O = 10 cm = 0.1 m
Using the superposition principle, each charge at corners contributes in the same direction to the total electric potential at point O.
=
Therefore the required potential at the centre is