A net charge of 38 mC passes through the cross-sectional area of a wire in 15 sA net charge of 38 mC passes through the cross-sectional area of a wire in 15 s.
(a) What is the current in the wire?
1 (b) How many electrons pass the cross-sectional area in 1.0 min?
a) The current is defined by,
current = charge / time or I = Q/t
In words it is it is the amount of charger per second.
I = 38 mC / 15 S
I = 2.533 mA.
b) The charge per second is 2.533 mC.
There charge for 1 min = 2.533 x 60
= 152 mC per min
The charge of an electron = 1.602 x 10^(-19) C
Therefore number of electrons per min,
= 152 mC per min / 1.602 x 10^(-19) C
= 9.488 x 10^17
The number of electrons per minute is 9.488 x 10^17.