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AP EAMCET2015PhysicsCurrent Electricity

A constant potential difference is applied between the ends of the wire. If the length of the wire is elongated 4 times, then the drift velocity of electrons will be

Options

  1. Aincreases 4 times
  2. Bdecreases 4 times
  3. Cincreases 2 times
  4. Ddecreases 2 times

Correct answer

B. decreases 4 times

Step-by-step solution

v_d 1 l v_ d₁ v_ d₂ = I₁ I₂ = 4 I I v_ d₂ = v_ d₁ 4 So drift velocity will decrease by 4 times

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