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Q.

Assertion(A) : Drift speed of electron is only of the order is 10^-3 ms^-1 for currents of range of a few ampere, but current is established as soon as the circuit is closed.
Reason (R) : When switch is closed electric field is established with speed of light and a local electron drifts at every point.

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a

A and R are true, R is correct explanation

b

A and R are true and R is not correct explanation

c

A is true, R is false

d

A and R is false

answer is A.

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Detailed Solution

Drift speed of electron is only of the order is 10^-3 ms^-1 for currents of range of a few ampere, but current is established as soon as the circuit is closed. When switch is closed electric field is established with speed of light and a local electron drifts at every point.

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