College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

If a current of 80.0 mA exists in a metal wire, (a) how many electrons flow past a given cross section of the wire in 10.0 min? (b) In what direction do the electrons travel with respect to the current?


To determine
The number of electrons passed through the cross section in 10 minutes.


Given Info: Current exists in the metal wire is 80mA and the electrons flowed for 10 minutes.


Formula to calculate the number of electrons through the metal wire is


  • I is the current flows through the metal wire,
  • q is the total charge flown,
  • t is the time interval which current exists,

Equation for total charge flowed is,


  • n is the number of electrons passed,
  • e is the charge of an electron

Substitute the relation for total charge in equation for current and rewrite I


Substitute 80mA for I , 1.60×1019C for e , 10 minutes for t in the above equation to find n ,



To determine
The direction of flow of electrons with respect to direction of flow of current.

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