College physics 2 question
How long does it take electrons to get from
the car battery to the starting motor? Assume
the current is 140 A and the electrons travel
through copper wire with cross sectional area
22.5 mm2 and length 81.7 cm . The mass den-
sity of copper is 8960 kg/m3 and the molar
mass is 63.5 g/mol.
Avogadro’s number is 6.022 × 1023
contributes one conduction electron.
Assume that each copper atom.
Answer in units of min
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corresponding to this current density. (Avogadro's number =
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The maximum rated current for a copper wire of cross-sectional
area 2 mm^2 is 20A. (a) What is the corresponding current density
in A/m^2? (b) On the assumption that each copper atom contributes
one conduction electron, calculate the electronic drift velocity
corresponding to this current density. (Avogadro's number =
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1 Current Density and Drift Speed a) (8 pts) A group of charges, each with charge q, moves with velocity v. The number of particles per unit volume is n. What is the current density J of these charges, in magnitude and direction? Make sure that your answer has units of Alm b) (8 pts) We want to calculate how long it takes an electron to get from a car battery...
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