A spherical shell with an inner radius $'a'$ and an outer radius $'b'$ is made of conducting material. A point charge $+Q$ is placed at the centre of the spherical shell and a total charge $-q$ is placed on the shell. Final charge distribution on the surfaces as
$-Q$ on inner surface, $-q$ on outer surface
$-Q$ on inner surface, $(-q +Q)$ on outer surface
$+Q$ on the inner surface, $(-q\,-Q)$ on the outer surface
The charge $-q$ is spread uniformly between inner and outer surface
Two point charges placed at a distance $r$ in air experience a certain force. Then the distance at which they will experience the same force in a medium of dielectric constant $K$ is
Charges $+q$ and $-q$ are placed at points $A$ and $B$ respectively which are at distance $2\,L$ apart, $C$ is the midpoint between $A$ and $B$ . The work done in moving a charge $+ Q$ along the semicircle $CRD$ is
The equivalent capacitance between points $A$ and $B$ of the circuit shown will be
The work done required to put the four charges together at the corners of a square of side $a$ , as shown in the figure is
Force between $A$ and $B$ is $F$. If $75\%$ charge of $A$ is transferred to $B$ then force between $A$ and $B$ is