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Manipal MET2011PhysicsCurrent Electricity

At what temperature will the resistance of a copper wire become three times its value at 0^ C ? (temperature coefficient of resistance for copper =4 10⁻³ / ^ C )

Options

  1. A400^ C
  2. B450^ C
  3. C500^ C
  4. D550^ C

Correct answer

C. 500^ C

Step-by-step solution

From definition of temperature resistance coefficient aligned R_t & =R₀(1+ t) 3 R₀ & =R₀ (1+4 10⁻³ t ) 3 & --1+4 10⁻³ t 4 & 10⁻³ t=2 t & = 2 4 10⁻³ & =500^ C aligned

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