The electron density in copper is 8.49 × 1028 electrons/m3. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is

Drift velocity in m/s is .

Explanation:

Formula for Drift Velocity is:

Where I is the current

n is the number of electrons in 1 or the electron density

A is the area of cross section and

q is the charge of one electron.

We are given the following:

n =

I = 1 A

A = 0.40 = 40

We know that q =

Putting all the values to find drift velocity:

So, drift velocity in m/s is .

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explanation:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it