Question

Using the results of the above example on Example 20.3, find the drift velocity in a copper wire of twice the diameter and carrying 20.0 A.

a. Same as the original wire
b. Four times the original
c. Half of the original
d. Twice the original

Answer 1

The drift velocity in a copper wire of twice the diameter and carrying 20.0 A is four times the original.

Step-by-step explanation:

To find the drift velocity in a copper wire of twice the diameter and carrying 20.0 A, we can use the equation I = nqAvd.

Since the diameter is twice the original, the area of the cross-section will be four times the original.

The current remains the same, so we can calculate the new drift velocity:

vd' = vd * (A' / A)

where A' is the area of the new wire and A is the area of the original wire.

Since A' = 4A, the new drift velocity will be four times the original (option b).