Assertion (A): In a meter bridge experiment,t | vedclass

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(C) In a meter bridge,the balance condition is given by $\frac{R}{S} = \frac{l}{100-l}$,where $R$ is the unknown resistance and $S$ is the standard re

Vedclass · Accepted Answer

If Assertion is true but Reason is false.

Vedclass · Answer

(C) In a meter bridge,the balance condition is given by $\frac{R}{S} = \frac{l}{100-l}$,where $R$ is the unknown resistance and $S$ is the standard resistance.When the unknown resistance $R$ is placed in a higher temperature enclosure,its resistance increases because the resistance of metals increases with temperature $(R_t = R_0(1 + \alpha \Delta T))$.To maintain the same null point position $(l)$,the ratio $\frac{R}{S}$ must remain constant.Since $R$ has increased,$S$ must also be increased to keep the ratio $\frac{R}{S}$ constant.The Assertion states that we should decrease $S$,which is incorrect.Therefore,the Assertion is false,while the Reason is true.

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