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Question

A conductor at 10C connected in the left gap of metre bridge gives balancing length 40 cm. When the conductor is at 60C, the balance point shifts by 5cm. The temperature coefficient of resistance of the material of the conductor is


Correct Answer
A
1210C
Your Answer
B
1220C
Your Answer
C
1200C
Your Answer
D
1201C

Solution

The correct option is A 1210C
R1R=l100l=4060=23R1=23RR2R=4510045=4555=911R2=911RR1=R0[1+αt1];R2=R0[1+αt2]23R=R0[1+10α](1)911R=R0[1+60α](2)(1)(2)23×119=1+10α1+60α
By showing
α=1210C1

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