A current of 1.6 ma flows through a conductor

Asked by admin @ 20/08/2021 in Physics viewed by 291 People

A current of 1.6 mA flows through a conductor if charge on an electron is -1.6* 10^-19 coulomb find the no. Of electrons that will pass each second through the cross section of that conductor

Answered by admin @ 20/08/2021

Current =1.6 mA=(1.6/1000) A=1.6×10⁻³ A
Time=1 sec
We know that,
Current=Charge/Time
⇒Charge=Current×Time
=1.6×10⁻³ A × 1 sec
=1.6×10⁻³ C

Then,Charge of 1 electron=1.6×10⁻¹⁹ C
⇒1.6×10⁻¹⁹ C of charge constitutes 1 electron
⇒1 C of charge constitutes =1/(1.6×10⁻¹⁹) electrons
⇒1.6×10⁻³ C of charge constitutes=(1.6×10⁻³)×[1/(1.6×10⁻¹⁹)]
=10⁻³/10⁻¹⁹
=10¹⁶

∴Hence,10¹⁶ electrons will pass each second through the cross section of that conductor.

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