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Questions  >>  CBSE XII  >>  Physics  >>  Current Electricity
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Q)

The electron drift speed is estimated to be only a few $mms^{-1} $ for currents in the range of a few amperes. How then is current established almost instant a circuit is closed.

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Solution :
The electric field spreads through out the circuit with speed of light.
At every point a local electron drift is induced by the field.
Hence the current attains its steady value almost instantaneously
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