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Question

At what temperature will the resistance of a copper wire become three times its value at 00 C? [Temperature coefficient of resistance for copper = 4×103per0C]:-

A
5000C
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B
4500C
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C
6000C
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D
None of these
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Solution

The correct option is A 5000C

Given,

Resistance become R=3Ro

R=R0(1+αΔT)

3Ro=Ro(1+αΔT)

ΔT=2α=24×103=500oC

Hence, when rise in temperature is 500oC


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