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Resistance and Resistivity

At what tempe...

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At what temperature, the resistance of a copper wire will become half of its value at 0°C. The average temperature coefficient of resistance for copper is 4 × 10–3 per °C

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Q. At what temperature will the resistance of a copper wire become three times its value at

0^{0}

C? [Temperature coefficient of resistance for copper =

4 \times 10^{- 3} p e r^{0} C

Q. A copper coil has a resistance of

2.43 Ω

50^{o} C

. Find its resistance at

60^{o} C

. The resistance temperature coefficient of copper is

0.0043

^{o} C

0^{o} C

Q. At which temperature the resistance of a copper wire will be double of the resistance at

0^{o} C

? (Resistance temperature coefficient is

4.0 \times 10^{- 3}^{0} C^{- 1}

Q. The resistance of a bulb filament is 100

Ω

at a temperature of 100

^{0}

C. If its temperature coefficient of resistance be 0.005 per

^{0}

C , its resistance will become 200

Ω

at a temperature of :

Q. The resistance of an iron wire and a copper wire at

20^{o} C

3.9 Ω

4.1 Ω

respectively. At what temperature will the resistance be equal ? Temperature coefficient of resistivity for iron is

5.0 \times 10^{- 3} K^{- 1}

and for copper it is

4.0 \times 10^{- 3} K^{- 1}

. Neglect any thermal expansion.

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