Answer :

Potential Difference of the spherical metal shell (V) = 15 × 106 V

Dielectric strength of the gas surrounding the electrode = 5 × 107Vm-1

Dielectric strength = Electric field intensity (E)

The minimum radius of the spherical shell (r),

r = 15 × 106 V/5 × 107 Vm-1 = 0.3m

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In a Van de GraffNCERT - Physics Part-I