1.

A 20 mu F capacitor is being charged by some constant voltage source. When p.d. across capacitor changes with time at a rate 3 V/s, find conduction current in the wires joining battery with capacitorand displacement current in the space between the plates.

Answer»

0, 0
`0, 60 mu A`
`60 mu A, 60 mu A`
`60 mu A, 0`

Solution :POTENTIAL DIFFERENCE between the plates of a capacitor is
`V=(Q)/(C )`
`THEREFORE Q=VC`
`therefore (dQ)/(dt)=C(dV)/(dt) ""(because " C = constant")`
`therefore i_(C )=C (dV)/(dt)`
`=20xx10^(-6)xx3`
`= 60xx10^(-6)A`
`i_(C )=60mu A`
`rArr i_(d) = 60 mu A "" (because i_(C )= i_(d))`


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