Question

A metal sphere a of radius a is charged to potential v

Answer 1

Ya.... so... there is these sphere you are saying, charged to a potential V

v= 1/(4πε) x (q1q2)/a

where ε = permittivity of free space

           q = charge

           a = distance/ radius

           v = potential

also relation between electric field E and v is

v = E a

use this knowledge and prosper for you havn't given me a proper question

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cheers :)