Help 60% CO Fri 11:10 PM a webassign.net 4. O -1 points My Not How long does it
ID: 3308482 • Letter: H
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Help 60% CO Fri 11:10 PM a webassign.net 4. O -1 points My Not How long does it take electrons to get from a car battery to the starting motor? Assume the current is 220 A and the electrons travel through a copper wire with cross-sectional area 0.16 cm2 and length 0.85 m. (HINT: The number of electrons per unit of volume in copper is 8.49x1028 electrons/m3) Submit Answer Save Progress 5···-11 points My Not A wire 4.38 m long and 6.00 mm in diameter has a resistance of 15.0 m2. A potential difference of 26.0 V is applied between the ends. Resistivity, (2-m) Temperature Coefficient of Resistivity, a(K-1) Material Silver Copper Typical Metals 1.62× 10-8 1.69× 10-8 4.1 x 10-3 4.3 × 10-3Explanation / Answer
Current density
J= nq ( velocity )
J= I/A
Velocity = I/A *nq
Distance travel=.85m
Velocity = d/t
time = d/ velocity
= d*A*nq /I
= .85*.16*10^-4*8.49*10^28*1.602*10^-19/220
= 840.79 second
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