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A wire when connected to 220 ~V mains supply has power dissipation P ₁ . Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is P₂ Then P₂: P₁ is

Options

  1. A1
  2. B4
  3. C2
  4. D3

Correct answer

B. 4

Step-by-step solution

P₁=V^2 / R ; P₂= V^2 (R / 2) + V^2 (R / 2) =4 V^2 R =4 P₁

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