Question 722: Electrostats & Capacitance

Question

The electric potential at the surface of an atomic nucleus $$(z=50)$$ of radius $$9 	imes 10^{-13} \mathrm{~cm}$$ is __________ $$	imes 10^6 \mathrm{~V}$$.

Accepted Answer

$$\begin{aligned}
& 	ext { Potential }=\frac{\mathrm{kQ}}{\mathrm{R}}=\frac{\mathrm{k} . \mathrm{Ze}}{\mathrm{R}} \
& =\frac{9 	imes 10^9 	imes 50 	imes 1.6 	imes 10^{-19}}{9 	imes 10^{-13} 	imes 10^{-2}} \
& =8 	imes 10^6 \mathrm{~V}
\end{aligned}$$

Electrostats & Capacitance

The electric potential at the surface of an atomic nucleus $(z=50) of radius 9 \times 10^{-13} \mathrm{~cm} is __________ \times 10^6 \mathrm{~V}$.

Choose the correct answer: