Question

A point charge Q is placed at the origin. Find the electrostatic energy stored outside the sphere of radius R centred at the origin.

Answer 1

Answer:

the electrostatic charge will be zero

Answer 2

Electrostatic energy (E) = Q2/8π ∈0 R

Explanation:

From the given,

Charge on the sphere = Q

Radius of the sphere = R

Capacitance of the sphere, $\mathrm{C}=4 \pi \in 0 \mathrm{R}$

The Energy of the Capacitor (E) = $1 / 2 \mathrm{CV} 2$

Where C = Capacitance of the circuit

V = Potential difference / voltage across the capacitor

∈0 = dielectric constant of the material used between the plates of the capacitor.

By substituting the values  

=1/2 X 4π∈0 R X Q2/ (4π∈0 R) 2

Hence,

Electrostatic energy (E) = Q2/8π ∈0 R