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BITSAT2016PhysicsCurrent ElectricityActual

The drift velocity of electrons in silver wire with cross-sectional area 3.14 10⁻⁶ ~m ² carrying a current of 20 ~A is. Given atomic weight of Ag =108, density of silver =10.5 10³ ~kg / m ³

Options

  1. A2.798 10⁻⁴ ~m / sec
  2. B67.98 10⁻⁴ ~m / sec
  3. C0.67 10⁻⁴ ~m / sec
  4. D6.798 10⁻⁴ ~m / sec

Correct answer

D. 6.798 10⁻⁴ ~m / sec

Step-by-step solution

Number of electrons per kg of silver = 6.023 10²⁶ 108 Number of electrons per unit volume of silver array c n= 6.023 10²⁶ 108 10.5 10³ array c v_ d = I n e A = 20 6.023 10²⁶ 10.5 10³ 1.6 10⁻¹⁹ 3.14 10⁻⁶ 108 =6.798 10⁻⁴ ~m / sec . array array

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