Using information in Example 20.6, what would the Hall voltage be if a 2.00-T field is applied across a 10-gauge copper wire (2.588 mm in diameter) carrying a 20.0-A current?

Data given in Example 20.6

Find the current in a long straight wire that would produce a magnetic field twice the strength of the Earth’s at a distance of 5.0 cm from the wire.

Strategy

The Earth's field is about 5.0 x 10-5 T, and so here B due to the wire is taken to be 1.0 x 10-4 T. The equation HOI B = can be used to find I, since all other quantities are known. 2xr