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$(A)$ Standard resistance coils require a resistance value that remains stable despite changes in ambient temperature. The temperature coefficient of

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Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.

Vedclass · Answer

$(A)$ Standard resistance coils require a resistance value that remains stable despite changes in ambient temperature. The temperature coefficient of resistance $(\alpha)$ determines how much the resistance changes with temperature according to the formula $R_t = R_0(1 + \alpha \Delta T)$. Alloys like constantan and manganin are specifically chosen because they possess a very low temperature coefficient of resistance. This property ensures that the resistance of the coils remains nearly constant even if the temperature fluctuates. Therefore, Assertion $A$ is true, Reason $R$ is true, and $R$ is the correct explanation of $A$.

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