Question

A 1.00 cm diameter plastic sphere, used in a static electricity demonstration, has a charge of 22.6 pC uniformly distributed on its surface. What is the potential at its surface (or just barely above it)?

Answer 1

Answer:

Electric potential,  V = 40.68 volts

Explanation:

Given that,

Charge on the sphere, $q=22.6\ pC=22.6\times 10^{-12}\ C$

Diameter of the plastic sphere, d = 1 cm

Radius, r = 0.5 cm

We need to find the electric potential at its surface. The potential at a surface is given by :

$V=\dfrac{kq}{r}$

$V=\dfrac{9\times 10^9\times 22.6\times 10^{-12}}{0.5\times 10^{-2}}$

V = 40.68 volts

So, the electric potential at its surface is 40.68 volts. Hence, this is the required solution.