A solid conducting sphere of radius $R_1$ is surrounded by another concentric hollow conducting sphere of radius $R_2$. The capacitance of this assembly is proportional to
$\frac{{{R_2} - {R_1}}}{{{R_1}{R_2}}}$
$\frac{{{R_2} + {R_1}}}{{{R_1}{R_2}}}$
$\frac{{{R_1}{R_2}}}{{{R_1} + {R_2}}}$
$\frac{{{R_1}{R_2}}}{{{R_2} - {R_1}}}$
When a lamp is connected in series with capacitor, then
Four capacitors of capacitance $10\,mF$ and a battery of $200\,V$ are arranged as shown. How much charge will flow through $AB$ after the switch $S$ is closed .....$\mu C$
The radius of a metallic sphere if its capacitance is $1/9\,F$, is
When two isolated conductors $A$ and $B$ are connected by a conducting wire positive charge will flow from :-
The capacitance of a spherical condenser is $1\,\mu F$. If the spacing between the two spheres is $1\,mm$, then the radius of the outer sphere is