# A horizontal compass is placed 0.29 m due south from a straight vertical wire carrying a 45 A current downward. Assume the horizontal component of the Earth's field at this point is 0.45E-4 T. In what direction does the compass needle point at this location? Give your answer as a decimal fraction of degrees west of north.

Question
Asked Dec 2, 2019
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A horizontal compass is placed 0.29 m due south from a straight vertical wire carrying a 45 A current downward. Assume the horizontal component of the Earth's field at this point is 0.45E-4 T. In what direction does the compass needle point at this location? Give your answer as a decimal fraction of degrees west of north.

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Step 1

Given data:

Current in the wire, I = 45 A

The earth’s magnetic field, BE = 0.45 x 10-4 T

Step 2

The magnetic field due to wire at the distance 0.29 m:

Step 3

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