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CUET
Physics
Electrostatic Potential and Capacitance
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$\text{Flux passing through the sphere of radius a } \phi = E 4\pi a^2 = k 4\pi a^3$
$ \phi = \frac{q_{in}}{\epsilon_0} = k4\pi a^3$
$ q_{in} = k 4\pi \epsilon_0 a^3$