Question
Explain volume charge density.

Answer

$i.$ Consider a charge $q$ uniformly distributed throughout a volume $V,$ then the volume charge density $\rho$ is given as
$\rho=\frac{q}{V}$
For example, charge on a plastic sphere or a plastic cube. If the charge is not distributed uniformly over the volume of a material, then charge $dq$ over small volume element $dV$ can be written as $dq = \rho dV.$
Image
$ii. \ S.I.$ unit of $p$ is $(C/m^3)$
$[$Note: Electric field due to a continuous charge distribution can be calculated by adding electric fields due to all these small charges.$]$

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