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Q. In this type of questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion : The capacity of a conductor, under given circumstances, remains constant irrespective of the charge present on it.
Reason : Capacity depends on size and shape of conductor and also on the surrounding medium.

Electrostatic Potential and Capacitance

Solution:

Charge present on a conductor determines its potential. Capacity is a function of size and shape of the conductor and of the surrounding medium. Capacitance in case of parallel plate capacitor $C=\frac{K \varepsilon_0 A}{d}$, where $K$ is dielectric constant of medium, $A$ is area of plates and $d$ is distance between them.