Question

A wire carries a current of 1 uA. If a charge on a electron is 1.5x10-¹⁹ C, then number of electrons flowing per second through the wire is​
a. 0.625 x 10¹³
b. 0.625 x 10¹⁹
c. 1.6 x 10-¹⁹
d. 1.6 x 10-¹³

Answer 1

Explanation:

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>>Charge on an electron is 1.6 × 10^-19 co

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Charge on an electron is 1.6×10

−19

coulomb. Number of electrons passing through the wire per second on flowing of 1 ampere current through the wire will be

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Solution

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Correct option is D)

The current is defined as rate of flow of charged particle.i.e.

i =

t

Q

Hence the charge flown is,

Q =i t

Hence Q =1.0×1=1C

The charge Q is due to electrons, therefore,

Q =N×e

Here Q =1C

If N is number of electrons passing and e is the electronic charge of value 1.6×10

−19

Then,

N =

e

Q

=

1.6×10

−19

1

=0.625×10

19

electrons

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