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Voltage and Current

Q1: Which unit of charge contains 6.25 × 1018 electrons?

A An ampere

B A coulomb

C A volt

D A joule

ANS:B - A coulomb

Q = (+/-) ne.

Q = Charge in coulombs.

N = No. of electrons.

E = Charge of electron = 1.6*10^-19.

N = 1/(1.6*10^-19) = 6.25*10^18.

Therefore 1 coulomb of charge contains.

= 6.25*10^18 electrons.



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