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Q.

Which of the following materials would you choose for making the coils of a resistance box?

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a

Copper

b

Manganin

c

Brass

d

Tin

answer is B.

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Detailed Solution

Manganin is used in making the resistance coils as its temperature coefficient is least. Due to less temperature coefficient of  Manganin there is no appreciable change in resistance with temperature. Hence it is best material to use for making of resistance boxes.

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