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Derive an expression for capacitance of...

Derive an expression for capacitance of a paralle plate capacitor

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Electric field between the plates of capacitor
`E = (sigma)/(epsi_0) = (Q)/(A epsi_0)`
`therefore ` Potential difference ,
` V = Ed = (Qd)/(A epsi_0)`
Capacitance
`C = Q/V = (epsi_0 A)/(d)`
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