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anonymous

  • 4 years ago

ok i have no idea, copper has oe free electron per atom, the number density of atoms in a sample of copper is 2.1x10^29 m^-3. The charge of the electron is 1.6x10^-19C The current in a copper wite of diameter 1.2mm is 7.2A Caculate the drift speed of the free electrons

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  1. JamesJ
    • 4 years ago
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    Think of this like a water hose now. The current I tells you how fast the water is coming out. I.e., the amount of charge. How much charge comes out in 1 second?

  2. JamesJ
    • 4 years ago
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    Call that number C. The calculate what volume of Copper is required to deliver that amount of charge.

  3. JamesJ
    • 4 years ago
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    \[ C = It = 7.2 \ Coulomb \]

  4. JamesJ
    • 4 years ago
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    In one cubic meter of copper we have 2.1 x 10^29 free electrons. How many Coulomb of charge is that?

  5. JamesJ
    • 4 years ago
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    Each electron has a charge of e = 1.6 x 10^-19 Coulomb Hence the charge of the free electrons in 1 cubic meter of copper is ... what?

  6. anonymous
    • 4 years ago
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    i think i need to read my book again lol this is very confusing to me

  7. JamesJ
    • 4 years ago
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    ok

  8. anonymous
    • 4 years ago
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    thanks for the help though

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