Q.

Given below are two statements : 

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. 

choose the correct answer from the options given below.

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a

Both A and R are true but R is not the correct explanantion of A

b

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

c

A is false but R is true

d

A is true but R is false

answer is A.

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Detailed Solution

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Since they have low temperature coefficient of resistance, their resistance remains almost constant

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