JEE MainPhysicsCurrent ElectricityNumerical+4 / −1
Resistance of a wire at and is found to be and respectively. The temperature in Kelvin scale is .
Numerical answer
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Correct answer: 748
- Use the linear temperature dependence of resistance
For a metallic wire, resistance varies as
where:
- is resistance at
- is temperature coefficient at
- is in
Given:
- Find using the value at
Using
Substitute values:
Divide by 10:
So,
- Use resistance at to find
So,
Divide by 10:
Hence,
- Convert to Kelvin
- Final Answer
The temperature in Kelvin scale is
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