If the capacity of a spherical conductor is $1$ picofarad, then its diameter, would be
$1.8 \times {10^{ - 3}}\,m$
$18 \times {10^{ - 3}}\,m$
$1.8 \times {10^{ - 5}}\,m$
$18 \times {10^{ - 7}}\,m$
Two spherical conductors $A$ and $B$ of radii $a$ and $b$ $(b > a)$ are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then the equivalent capacitance of the system is
The capacity of a spherical conductor in $ MKS$ system is
In an isolated parallel plate capacitor of capacitance $C$, the four surface have charges ${Q_1}$, ${Q_2}$, ${Q_3}$ and ${Q_4}$ as shown. The potential difference between the plates is
The capacity of the conductor does not depend upon
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 .....$\mu C$