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When a current I is set up in a wire of radius r, the drift velocity is vd· If the same current is set up through a wire of radius 2 r, the drift velocity will be: -

Question

When a current I is set up in a wire of radius r, the drift velocity is v_d· If the same current is set up through a wire of radius 2 r, the drift velocity will be:

Options

4 v_d
2 v_d
v_d/2
v_d/4

MCQ

Solution

v_d/4

Explanation:

I = n A e v_d or v_d ∝ 1/πr²

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Drift of Electrons and the Origin of Resistivity

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When a current I is set up in a wire of radius r, the drift velocity is vd· If the same current is set up through a wire of radius 2 r, the drift velocity will be: -

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When a current I is set up in a wire of radius r, the drift velocity is vd· If the same current is set up through a wire of radius 2 r, the drift velocity will be: -

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