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Explain the underlying principle of working of a parallel plate capacitor . If two similar plates , each of area A , having surface charge densities +sigma and -sigma are separated by a distance 'd' in air , write expression for : the electric field at points between the plates .

Answer»

SOLUTION :For underlying principle of working of a parallel plate capacitor .
If TWO similar PLATES , each of area A , have surface charge densities `+sigma` and `-sigma` and are SEPARATED by a distance d in air , then
the electric field at any point between the plates
`VECE = vecE_(1) + vecE_(2) = (sigma)/(2 in_(0)) + (sigma)/(2 in_(0)) = (sigma)/(in_(0))` towards plate 2.


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