Multiple choice

The potential difference applied to a device is 5 KV. Calculate the number of electrons per second where current through it is 3.2 mA.

  1. 5.12 × 10-21

  2. 0.19 × 1021

  3. 2 × 1016

  4. 16.38 × 10-25

  5. 0.061 × 1025
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given: i = 3.2 x 10-3, t = 1, e = 1.6 x 10-19 i = q / t = ne / t n = it / e = 3.2 x 10-3 x 1 / 1.6 x 10-19 = 2 × 1016

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