Question

40 mA current flows for 40 second in a wire. The
charge on the wire is
(a) 1.6 coulomb (b) 0C
(c) 9.1 C
(d) 1.6 x 10-19 C​

Answer 1

Answer:

Correct option is (c)

Explanation:

A current of 1 ampere is said to flow when 1 coulomb of charge passes a given point in 1 sec.

Charge flowing through a conductor in one second is given as charge=current×time. It is given that the current through the conductor is 1.6 mA, that is, 1.6×10

−3

A

Therefore, charge =1.6×10

−3

×1=1.6×10

−3

C.

Number of electrons passing through the conductor in one second is given as

e

Q

=

1.6×10

−19

1.6×10

−3

=10

16

Hence, the number of electrons passing through the conductor in 1 second is 10

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