# 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...

A net charge of 38 mC passes through the cross-sectional area of a wire in 15 s

A 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?

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### 1 Answer

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.

Therefore,

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.**

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