A wire has a non-uniform cross-section as shown in figure. A steady current flows through it. The drift speed of electrons at points P and Q is $v_{P}$ and $v_{Q}$ , then?

v_{P} = v_{Q}

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v_{P} < v_{Q}

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v_{P} > v_{Q}

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Data is insufficient

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Solution

The correct option is B $v_{P} > v_{Q}$
Answer C: $v_{P} > v_{Q}$
Because $I = n e A v d$ and as $A$ increases $v d$ must decrease to keep $I$ constant.

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