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NEET Physics Current Electricity 2024 NEET 2024 (Re-NEET)

NEET Physics Question (2024) — Solution

Question

A uniform wire of diameter d carries a current of 100 mA when the mean drift velocity of electrons in the wire is v. For a wire of diameter d 2 of the same material to carry a current of 200 mA , the mean drift velocity of electrons in the wire is

Options

  1. A. 4 v
  2. B. 8 v
  3. C. v
  4. D. 2 v

Answer

B. 8 v

Step-by-step solution

current i=n A v_d e ( v_d= mean drift velocity ) =n ( D^2 4 ) v_d e i D^2 v_d 100 200 = (d)^2 ( d 2 )^2 v v^ v^ =2 2^2 v=8 v

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