contestada

The current in a wire is 4.0 amperes. The time
required for 2.5 × 10^19 electrons to pass a certain
point in the wire is
(1) 1.0 s (3) 0.50 s
(2) 0.25 s (4) 4.0 s

Respuesta :

kmatras1
The correct answer is option 1. 

To solve, you will first multiply 2.5x10^19 times the charge of an electron (1.6x10^19). Then, see what you need to divide it by (in seconds) to get to 4. The answer that gives you 4 (the number of amperes) is the correct answer. 

Since 2.5 x 1.6 = 4, you would only have to divide it by 1 second. 

batolisis

The time required for the electrons to pass a certain point in the wire is : ( A ) 1.0 s

Determine the time required

Given that :

charge on a electron = 1.6 * 10¹⁹

number of electrons = 2.5 * 10¹⁹

Next step : determine the time required

Current in wire  = charge on electron * number of electorns / time require

4 amperes = ( 1.6 * 2.5 ) / time required  

therefore :

Time required = ( 1.6 * 2.5 ) / 4 amperes

                        = 1 sec

Hence we can conclude that The time required for the electrons to pass a certain point in the wire is : ( A ) 1.0 s

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