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
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