A long, straight wire perpendicular to this page carries a current of 4.69 A dir

Question

A long, straight wire perpendicular to this page carries a current of 4.69 A directed into the page. Find the magnetic field at the following points, all 11.1 cm from the wire.

(a) 11.1 cm to the left of the wire
magnitude:
direction: upward/downward/left/right

(b) 11.1 cm directly below the wire
magnitude:
direction: upward/downward/left/right

(c) 11.1 cm to the right of the wire
magnitude:
direction: upward/downward/left/right

(d) 11.1 cm directly above the wire
magnitude:
direction: upward/downward/left/right

Explanation / Answer

Magnetic field of a current carrying wire only depends upon the current and the distance from it. Thus, all magnitudes will be the same because all are at the same distance away.

B = o/2 I/r

B = (2*10^-7) (4.69A)/(11.1*10^-2m) = 8.45*10^-6 T

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