Questions
The resistance of a wire is 5 ohm at 50°C and 6 ohm at 100°C. The resistance of the wire at 0°C will be
a
4 ohm
b
3 ohm
c
2 ohm
d
1 ohm
detailed solution
Correct option is A
We know thatRt=R0(1+αt)Applying this formula, we get R50=R0(1+50α)=5 ...(1)and R100=R0(1+100α)=6 ...(2)Multiplying eq. (1) by 2, we get 2R0(1+50α)=10or 2R0+100α=10 ...(3)Subtracting eq. (2) from eq.(3), we get2R0−R0=10−6=4∴ R0=4ΩTalk to our academic expert!
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