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BITSAT2020PhysicsCurrent ElectricityActual

Two wires A and B of the same material, having radii in the ratio 1: 2 and carry currents in the ratio 4: 1 . The ratio of drift speed of electrons in A and B is

Options

  1. A16: 1
  2. B1: 16
  3. C1: 4
  4. D4: 1

Correct answer

A. 16: 1

Step-by-step solution

Current flowing through the conductor, I = n e v A . Hence 4 1 = nev _ d ₁ (1)² nev _ d ₂ (2)² or v_ d ₁ v _ d ₂ = 4 1 1 = 16 1

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