The dielectric strength of air at $NTP$ is $3 \times {10^6}\,V/m$ then the maximum charge that can be given to a spherical conductor of radius $3\, m$ is
The dielectric strength of air at $NTP$ is $3 \times {10^6}\,V/m$ then the maximum charge that can be given to a spherical conductor of radius $3\, m$ is
- A
$3 \times {10^{ - 4}}\,C$
- B
$3 \times {10^{ - 3}}\,C$
- C
$3 \times {10^{ - 2}}\,C$
- D
$3 \times {10^{ - 1}}\,C$
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