A metal sphere has a charge of `-6 muC ` . When `5 xx 10 ^(12)` electrons are removed from the sphere, what would be net charge on it?

Explanation

Here, `q_1 = - 6 mu C , n = 5 xx 10 ^(12) and q_2 = n e `
`= 5xx 10 ^(12) xx (1.6 xx 10 ^(-19)) " " [because e= 1.6 xx 10 ^(-19) C]`
` = 8.0 xx 10^(-7)C `
` = 0.8 xx 10 ^(-6) C rArr q_2 = 0.8 muC `
Since electrons are removed from the sphere ` q_2` is positive . Therefore , net charge on the sphere,
` q = q_1 +q_2 = (-6.0 +0.8) mu C = - 5.2 mu C `