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Problem:
Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. Wire B has 5 times the cross-sectional area, 1.1 times as many mobile electrons per cubic centimeter, and 2 times the mobility of wire A. In the steady state, 2E18 electrons enter wire A every second. How many electrons enter wire B every second?
Equation:
i = nAuE
n = Electrons/cubic meter
A = cross-sectional area
u = mobility of electrons
E = electric fieldSolution:
ib=ia * 2*5*1.1E6
it is 1.1E6 because the mobility factor needs to be in electrons/ cubic meter
ib = 2.2E25
Webassign says that's wrong. I can't come up with anything else
Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. Wire B has 5 times the cross-sectional area, 1.1 times as many mobile electrons per cubic centimeter, and 2 times the mobility of wire A. In the steady state, 2E18 electrons enter wire A every second. How many electrons enter wire B every second?
Equation:
i = nAuE
n = Electrons/cubic meter
A = cross-sectional area
u = mobility of electrons
E = electric fieldSolution:
ib=ia * 2*5*1.1E6
it is 1.1E6 because the mobility factor needs to be in electrons/ cubic meter
ib = 2.2E25
Webassign says that's wrong. I can't come up with anything else