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Question

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:
475567.png
  1. varies unpredictably
  2. increases from P to Q
  3. decreases from P to Q
  4. is constant throughout the wire

A
increases from P to Q
B
decreases from P to Q
C
varies unpredictably
D
is constant throughout the wire
Solution
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Since the current through conductor is same everywhere (assuming no losses). Since IAv, 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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