Current Electricity

JEE Main level, single correct, medium

64 of 380

Question 64 of 380

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.
Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.
In the light of the above statements, choose the correct answer from the options given below.

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Answer: (A) Both A and R are true and R is the correct explanation of A

The alloys manganin and constantan are used for making standard resistance coils as they have high resistivity, low-temperature coefficient of resistance, ability to attain good resistance values in small size. Their resistance value would change very little with temperature.
Thus, both A and R are true and R is the correct explanation of A.

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