Question

At a certain location, Earth has a magnetic field of 0.60 ✕ 10⁻⁴ T, pointing 75° below the horizontal in a north-south plane. A 11.0 m long straight wire carries a 14 A current.

(a) If the current is directed horizontally toward the east, what are the magnitude and direction of the magnetic force on the wire?

magnitude	N
direction	---Select---horizontal and directed due easthorizontal and directed due west15° above the horizontal in the northward direction15° below the horizontal in the southward direction75° above the horizontal in the northward direction75° below the horizontal in the southward direction

(b) What are the magnitude and direction of the force if the current is directed vertically upward?

magnitude	N
direction	---Select---horizontal and directed due easthorizontal and directed due west15° above the horizontal in the northward direction15° below the horizontal in the southward direction75° above the horizontal in the northward direction75° below the horizontal in the southward direction

Answer 1

A)

Force, F = BIL

F = 0.6 x 10^-4 x 14 x 11 = 9.24 x 10^-3 N

(15 degree above horizontal to North)

B)

F = 0.6 x 10^-4 x 14 x 11 sin(165) = 2.39 x 10^-3 N

(into page towards WEST)

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