EXAMPLE 20-2 Measuring a magnetic field. A rectangular loop of wire hangs vertically as shown in Fig. 20-13. A magnetic field B is directed horizon- tally, perpendicular to the wire, and points out of the page at all points as represented by the symbol O. The magnetic field B is very nearly uniform along the horizontal portion of wire ab (length I = 10.0 cm) which is near the center of the gap of a large magnet producing the field. The top portion of the wire loop is free of the field. The loop hangs from a balance which measures a downward force (in addition to the gravitational force) of F 3.48 x 10 N when the wire carries a current I = 0.245 A. What is the magnitude of the magnetic field B? 10.0 cm B (toward viewer) O 0 0 O O 0.0 O CO00 O 0.0 O O O O O

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Magnetic Force

A magnetic force arises when a charged particle or a current-carrying conductor is placed in a magnetic field. It is created because of the movement of the charged particles.