A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons:

varies unpredictably

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increases from P to Q

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decreases from P to Q

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is constant throughout the wire

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Solution

The correct option is C decreases from P to Q
Since the current through conductor is same everywhere (assuming no losses). Since $I \propto A v$ , the product of area and drift velocity must remain constant. As the area increases from P to Q, drift velocity will correspondingly decrease from P to Q.

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A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons:

The correct option is C decreases from P to QSince the current through conductor is same everywhere (assuming no losses). Since I∝Av, the product of area and drift velocity must remain constant. As the area increases from P to Q, drift velocity will correspondingly decrease from P to Q.