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NEET2009PhysicsCurrent ElectricityActual

When a current is passed in a conductor, 3^ C rise in temperature is observed. If the strength of current is made thrice, then rise in temperature will approximately be

Options

  1. A36^ C
  2. B27^ C
  3. C18^ C
  4. D9^ C

Correct answer

B. 27^ C

Step-by-step solution

aligned & (b) : H=I^2 R t=m c & I^2 aligned Hence ₂ ₁ = ( I₂ I₁ )^2 or ₂ 3 = ( 3 I I )^2 or ₂=9 3=27^ C

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