Q.
A battery of emf E is connected across a conductor as shown. As one observes from A to B,Now, match the given columns and select the correct option from the codes given below.
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a
i-p, ii-q, iii-r, iv-s
b
i-r, ii-q, iii-q, iv-q
c
i-q, ii-p, iii-s, iv-r
d
i-s, ii-q, iii-q, iv-p
answer is B.
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Detailed Solution
Current through any cross-section should remain same as all the cross-sections are in series.I=neAvd, area increases drift velocity decreases. E is directly proportional to vd, so E also decreases. lf E decreases, then potential difference across a segment of fixed length also decreases.This can also be done like this:dR=ρdxA; A increases with x.Potential across dx: dV = IdR=IρdxAE=dVdx = IρA ∝ 1ASo E and dVdx both decrease as A increases.
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