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Q.

A copper conductor of fixed length has a variable cross sectional area. A battery of emf E is connected between the ends of the conductor. If Vd represents average drift velocity of free electrons at a section of area A, then

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a

Vd∝A

b

Vd∝1A

c

Vd∝1A

d

Vd does not depend on A.

answer is B.

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Detailed Solution

Vd=Jne=(iA)ne=(ine)1ASince same current i is flowing through all sections of the conductor, we can conclude Vd∝1A
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A copper conductor of fixed length has a variable cross sectional area. A battery of emf E is connected between the ends of the conductor. If Vd represents average drift velocity of free electrons at a section of area A, then