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NEET2008PhysicsCurrent ElectricityActual

Two heater wires, made of the same material and having the same length and the same radius, are first connected in series and then in parallel to a constant potential difference. If the rates of heat produced in the two cases are (H_s ) and (H_p ) respectively, then (H_s / H_p ) will be

Options

  1. A(1 / 2 )
  2. B2
  3. C(1 / 4 )
  4. D4 .

Correct answer

C. (1 / 4 )

Step-by-step solution

When heater wires are connected in series, then equivalent resistance, R_s=R₁+R₂=2 R ( R₁=R₂ ) Rate of heat produced, H_s= V^2 R_ s

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