Two electric charges $12\,\mu C$ and $ - 6\,\mu C$ are placed $20\, cm$ apart in air. There will be a point $P$ on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of $P$ from $ - 6\,\mu C$ charge is.......$m$
$0.10$
$0.15 $
$0.20 $
$0.25$
Write the relation between the electric field of an electric charge and electrostatic potential at any point.
Define electric potential and explain it. Write its $\mathrm{SI}$ unit and give its other units.
Draw a graph showing variation of potential with $r$ distance for a uniformly charged spherical shell.
Two tiny spheres carrying charges $1.5 \;\mu\, C$ and $2.5\; \mu\, C$ are located $30 \;cm$ apart. Find the potential and electric field
$(a)$ at the mid-point of the line joining the two charges, and
$(b)$ at a point $10\; cm$ from this midpoint in a plane normal to the line and passing through the mid-point.
A solid sphere of radius $R$ is charged uniformly. At what distance from its surface is the electrostatic potential half of the potential at the centre?