Electron drift speed

  • Thread starter kyang002
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  • #1
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The electron drift speed in a gold wire is 3.0 * 10^-4.

1. What is the current density in the wire?

2. What is the current if the wire diameter is 0.50 mm?

J = I / A
and I = nqva

What is the answer?
 

Answers and Replies

  • #2
ehild
Homework Helper
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kyang002 said:
The electron drift speed in a gold wire is 3.0 * 10^-4.

1. What is the current density in the wire?

2. What is the current if the wire diameter is 0.50 mm?

J = I / A
and I = nqva

What is the answer?

You get from your formulas that the current density is J = nqv.
You should know the meaning of the letters.
n is the number of free carriers in unit volume. q is the charge of the free carriers and v is their drift speed.
Is anything you do not know from these?

ehild
 

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