Question

A wire of radius 0.15 mm is made of an unknown metal and carries a current...

A wire of radius 0.15 mm is made of an unknown metal and carries a current of 8.4 mA. The drift velocity for electrons in the wire is measured to be 36 x 10-6 m/s. What is the carrier density of the metal from which the wire is made?

a. 4.2 x 1030 m-3

b. need more information to do this calculation.

c. 4.2 x 1028 m-3

d. 1.3 x 1029 m-3
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Homework Answers

Answer #1

Current through the conductor is

where e is the charge of the electron, n is the carrier density, A is the crossectional area, is the drift velocity.

Given:

I = 8.4 mA= 8.4*10^-3 A

m^2

e= 1.60217662 × 10-19 C

So carrier density

Actual answer is

The closed answer is option c.

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