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Why does galvanometer show a momentary d...

Why does galvanometer show a momentary deflection at the time of charging or discharging a capacitor? Write the necessary expression to explain this observation?

Text Solution

Verified by Experts

During charging or discharging or a capacitor,
increasing or decreasing current in a circuit with
time flows due to conduction current in wire and
displacement current between the plates of the
capacitor. When capacitor gets fully charged
both conduction and displacement current
becomes zero. That is why galvanometer shows
a momentary deflection at the time of charging or discharging. The expression to explain this
observation is : `ointvecB.vec(dl)=mu_0(I+I_D)`
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