If a current of 74.0 mA exists in a metal wire, how many electronsflow past a gi

Question

If a current of 74.0 mA exists in a metal wire, how many electronsflow past a given cross section of the wire in 10.5 minutes?
electrons

In what direction do the electrons travel with respect to thecurrent?
nomotion
directionopposite    
direction with
direction perpendicular If a current of 74.0 mA exists in a metal wire, how many electronsflow past a given cross section of the wire in 10.5 minutes?
electrons

In what direction do the electrons travel with respect to thecurrent?
nomotion
directionopposite    
direction with
direction perpendicular nomotion
directionopposite    
direction with
direction perpendicular nomotion
directionopposite    
direction with
direction perpendicular

Explanation / Answer

   Current, i 74 mA = 0.074 A    time, t = 10.5 minutes = 10.5 X 60 = 630s    charge of electron, e = 1.6 X 10-19 C       i = q / t = n e / t      number of electrons,n = i t /e =(0.074) (630) / ( 1.6 X 10 -19 ) = 29.14 X 10 19    Direction of flow of eletrons = opposite tothe direction of current    Direction of flow of eletrons = opposite tothe direction of current

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