Question

When ${10}^{12}$ electrons are removed from a neutral metal sphere, the charge on the sphere becomes:

• A. $0.16\mu C$
• B. $-16\mu C$
• C. $32\mu C$
• D. $-32\mu C$

Answer 1

The correct option is A $0.16\mu C$

$n={10}^{12},q=ne={10}^{12}\times 1.6\times {10}^{-19}=1.6\times {10}^{-7}C$
$q=0.16\mu C$, Electrons are removed so metal sphere becomes positive.