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The capacitance of any conductor is its capacity to store charge. As the quantity of charge on conductor is increased its potential also increases. Beyond a limit even if a small additional charge is given then it starts leaking. Hence Q µ V or Q = CV. Where C is called capacitance of the conductor. It depends upon geometrical shape and size of the conductor. If V = 1 volt, then Q = C, hence capacitance of any conductor will be numerically equivalent to that charge which makes its potential equal to 1 volt. Unit of capacitance is ‘Farad’: 1 Farad = 1 coulomb/1 volt. = coulomb/ (joule/coulomb). = coulomb2/joule. = (ampere x second) 2 / ( Newton x meter). 3) Dimensions of capacitance:  In practice 1 Farad is very large capacity therefore its small units are as following: 1) 1 micro-farad = 10-6 farad = 1mf. 2) 1 nano-farad = 10-9 farad = 1hf. 3) 1 pico-farad or micro-micro farad = 10-12 farad = 1rf = 1mmf. 4) Capacitance of spherical conductor: For a spherical conductor of radius R, Potential is   Fig (1) 1)  . 2) C µ R. 3) C (capacitance) does not depend upon the charge given. 5) Energy stored in a charged conductor:  6) Redistribution of charge:  Fig (2)
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Vriti Edustore
