A copper wire of length l and diameter d has potential difference V applied across its two ends. The drift velocity is Vd. If the diameter of the wire is made d / 2, then the drift velocity becomes a.) Vd. b.) 4Vd. c.) Vd / 4. d.)Vd / 2.

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chemistry tutor

b option is correct
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Option A.
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Specialization in Organic Chemistry. Teaching Chemistry has always been my passion.

A) vd;
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Teaching Physics for JEE MAIN and JEE ADVANCE.

b)4vd bcoz current I=neA vd
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A
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a is correct.
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biology

a). Vd.
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Classical physics predicts that vd = eE/m * Tau (e = charge on electron, E = Electric Field, m = mass of electron, Tau = relaxation time, depends on material), hence independent of cross sectional area.
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chemicals of chemistry

C
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