On rotating a point charge having a charge $q$ around a charge $Q$ in a circle of radius $r$. The work done will be
$q \times 2\pi r$
$\frac{{q \times 2\pi Q}}{r}$
Zero
$\frac{Q}{{2{\varepsilon _0}r}}$
For equal point charges $Q$ each are placed in the $xy$ plane at $(0, 2), (4, 2), (4, -2)$ and $(0, -2)$. The work required to put a fifth change $Q$ at the origin of the coordinate system will be
Explain electric potential energy. Show that the sum of kinetic energy and electric potential energy remains constant.
Obtain equation of electric energy of a single charge.
Six charges $+ q ,- q ,+ q ,- q ,+ q$ and $- q$ are fixed at the corners of a hexagon of side $d$ as shown in the figure. The work done in bringing a charge $q _0$ to the centre of the hexagon from infinity is :$\left(\varepsilon_0-\right.$ permittivity of free space)
A point charge $q$ is surrounded by eight identical charges at distance $r$ as shown in figure. How much work is done by the forces of electrostatic repulsion when the point charge at the centre is removed to infinity?