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In the given figure, a battery of emf E is connected across a conductor PQ of length ' $l$ ' and different area of cross-sections having radii $r_{1} and r_{2} (r_{2} < 1)$ .
Choose the correct option as one moves from P to Q:

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Drift velocity of electron increases

Electric field decreases

Electron current decreases

All of these

answer is A.

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Detailed Solution

The current remains constant.

Drift velocity is given by $V_{d} = \frac{I}{neA}$

$V_{d} \propto \frac{1}{A}$

As area of cross section decreases drift velocity increases.

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