Assuming that the charge of an electron is 1.6 × 10-19 C, the number of electrons passing through a section of wire per second when the wire carries a current of 1 A is:

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RRB ALP CBT I 17 Aug 2018 Shift 3 Official Paper
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  1. 1.6 × 10-19
  2. 1.6 × 1019
  3. 0.625 × 1017
  4. 6.25 × 1018

Answer (Detailed Solution Below)

Option 4 : 6.25 × 1018
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Detailed Solution

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The correct answer is 6.25 x1018.

Key Points

  • Given:
    • Current, I = 1A
    • Time = 1s
  • Using the formula,
    • Q = I x T
    • Q = 1 x1
    • C = 1
  • Now if the charge is 1.6 x 10-19C, the number of electron is 1.So, if the charge is 1 C, the number of electron given by-
    • 1/(1.6 x 10-19) x 1
    • 6.25 x 1018
  • Thus, 6.25 x 1018 electrons should pass through a conductor in one second to constitute 1 ampere current.

Additional Information

  • Electric Current:
    • Electric current in basic terms is the flow of electric charge.
    • Common charge carriers are electrons, but they can also be ions as in the case of a chemical battery.
    • The unit of amperage in the SI system is the ampere (A), 1 ampere is the amperage when a charge of 1 coulomb passes through the cross-section for 1 second.
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