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Combination of Resistances

In metre brid...

Question

In metre bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is 'l'. If the temperature of water is increased, the new balancing length is

A

>l

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B

none

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C

=0

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D

=l

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Solution

The correct option is A >l
$\begin{matrix} \frac{R_{u n k n o w n}}{R_{s tan d a r d}} = \frac{l}{(1 - l)} . I f t e m p e r a t u r e i n c r e a s e s, r e s i s tan c e i n c r e a s e s . \end{matrix}$
Hence, Option $A$ is correct.

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