Current passing through the wire, when the charge Q = 2 milli
Coulombs flows through a wire in time 4 milli seconds is?
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Answer:A current of 2A passes through a wire for 20 minutes. The number of electrons that crossed the cross-section in this period is
Given
Current through the wire is I=2A
Time for which current flows through the wire is t=20min=20×60s
Let n and e be the number and charge of electrons that crossed the cross-section of wire in time t.
Now, the total charge, q(say) in the wire is
q=ne
Hence, the current flowing in time t is
I=
t
q
I=
t
ne
∴n=
e
It
∴n=
1.6×10
−19
(2)(20×60)
∴n=
1.6×10
−19
2400
∴n=1500×10
19
∴n=1.5×10
22
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