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ELECTRIC POTENTIAL AND CAPACITANCE

Physics
Inter Second Year
English
Very Short Answer Questions
Q1. The dielectric strength of air $= 3\times10^{6 }$ V/m at certain pressure. A parallel plate capacitor with air in between the plates as
 a plate separation of 1cm can you charge the capacitor to$3\times10^{6 }$  V?

Answer

Ans. No. distance between plates, $d = 1\:cm \:\:= 1\times10^{-2 }$\:\:m
 Potential difference between the plates, $V= 3\times10^{6 }$  V
∴Electric field between plates
 $E= V/d=\frac{ 3\times10^{6 }} {1\times10^{-2 }} = 3\times10^{8 }$  V/m
This is more than the dielectric strength of air $= 3\times10^{8 }$  V/m. so it is no possible.