A large C-shaped magnet (whose poles are shown here) has a region of uniform mag

Question

A large C-shaped magnet (whose poles are shown here) has a region of uniform magnetic field between its poles.

(a) A wire in the region between the poles carries a current or 240 mA directed out of the page. What is the direction of the magnetic force on the wire?

(b) The magnitude of the magnetic force on the wire is 0.047 N, and the segment of wire that is in the field is 20 cm long. What is the magnitude of the magnetic field in the region between the poles of the magnet?

Explanation / Answer

(A) According to Fleming's left hand rule, force on the wire acts towards right.

(B) F=BIL sin 90

0.047 N = B (240 * 10-3 A) (0.20 m) (1)

B = 0.98 T

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