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The number of free electrons per of ordinary copper wire is about . The average drift speed of the electrons is . The current flowing is:-
(a)
(b)
(c)
(d)

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Important Questions on Current Electricity
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A wire has a non-uniform cross-section as shown in the figure. A steady current flows through it. The drift speed of electrons at points and is and , then:-

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Assertion :- In a metallic conductor, current is due to the drift of free electrons in a definite direction.
Reason :- A current carrying conductor is negatively charged.

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