30_An isolated conductor cannot have a large capacitance-by-Diwakar Karuppiah || தமிழ்
Channel: P6 Scholars Academy
Date: 2020-08-25

An isolated conductor cannot have a large capacitance, why?
 The capacitance of an isolated conductor is small. When a conductor hold a large amount of charge, its potential is also high. If the associated electric field (E = σ〖/𝜀〗_𝑜) becomes high enough,the atoms or molecules of the surrounding air get ionised. A breakdown occurs in the insulation of the surrounding medium and the charge put on the conductor gets neutralised or leaks away. For air, the breakdown point occurs at field of the order of 3×〖10〗^6 𝑉𝑚^(−1). This puts the limit on the capacitance of a conductor. Moreover, if we tend to have a single conductor of large capacitance, it will have practically inconvenient large size