What force is needed to propel a 421-kg car with an acceleration of 3.77 m/s2?
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The current is defined as the amount of charge Q that passes through a given point of a wire in a time 
:
Since I=500 A and the time interval is
the charge is
One electron has a charge of
, therefore the number of electrons that pass a point in the wire during 4 minutes is
electrons
Since I=500 A and the time interval is
the charge is
One electron has a charge of