Explain the underlying principle of working of a parallel plate capacitor. If two similar plates, each of area A having surface charge densities and are separated by a distance +sigma to -sigma d in air, write expressions for (i) the electric field at points between the two plates. (ii) the potnetial difference between the plates. (iii) the capacitance of the capacitor so formed.
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Thank you for asking this question. Here is your answer:
1) Electric field due to am infinite sheet of charge is E'=?/2?
Thus between two sheets it would be
E=?/2? + ?/2?
= ?/?
2) Potential difference between them is V= Ed
3) Capacitance: C=Q/V
V = ?d/? = Qd/A? (because ? = Q/A)
C= ?A/d
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