A neutral spherical copper particle has a radius of 10 ,nm left(1 ,nm =10^{-9} ,m right) . It gets c

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2. Electric Potential and Capacitance

normal

A neutral spherical copper particle has a radius of $10 \,nm \left(1 \,nm =10^{-9} \,m \right)$. It gets charged by applying the voltage slowly adding one electron at a time. Then, the graph of the total charge on the particle versus the applied voltage would look like

A

B

C

D

(KVPY-2019)

Solution

$(a)$ From $V=\frac{k q}{r}$,

$q=\frac{V \cdot r}{k}=C \cdot V$

As, $q=n e$, hence graph of quersus $V$ is a step function.

Standard 12

Physics

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