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KCET2019PhysicsCurrent Electricity

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

Options

  1. Aelectron number density depends on temperature
  2. Belectron number density is very large
  3. Crelaxation time is small
  4. Ddrift velocity of electron is very large

Correct answer

B. electron number density is very large

Step-by-step solution

(B) Current I = neAV ( _ d ) The large value of ( I ) is because of number density of free electrons in a conductor ( (n) ) which is of the order ( n=10²⁸ ) per ( m³ )

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