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Q.

In the given potentiometer arrangement a cell is balanced on length $l$ across potentiometer wire as shown in figure. If cross sectional radius at potentiometer wire is made double then balancing length on wire would be

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a

$\frac{l}{4}$

b

$l$

c

$2 l$

d

$\frac{l}{2}$

answer is D.

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Detailed Solution

$e = \frac{E}{L} \times l$

Balancing length is independent of radius of potentiometer wire.

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In the given potentiometer arrangement a cell is balanced on length l across potentiometer wire as shown in figure. If cross sectional radius at potentiometer wire is made double then balancing length on wire would be