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Question

425 Coulomb of charge contains .......... electrons
  1. 1015
  2. 1018
  3. 1020
  4. None of these

A
None of these
B
1018
C
1015
D
1020
Solution
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The formula for quantization of charge is given as q=ne.
where q is the amount of charge in Columbu's, n is the number of charges and e is the charge on the electron.
In this case, q=4/25 C
So, e = 1.6×1019C.
n can be calculated as n=q/e = 425×[11.6×1019C]=1018 which is the number of electrons.
Hence, 4/25 Coulomb of charge contains 1018 electrons.

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