Unformatted text preview: 00 T to a new position where B = 0.55 T. If the displacement occurs in 0.25 s and the area of the coil is perpendicular to the magnetic field lines, what is the resulting average emf induced in the coil? 0.63V 3) A coil of 325 turns and an area of 19.5 × 10 −4 m 2 is removed from a uniform magnetic field at an angle of 45° in 1.25 s. If the induced emf is 15 mV, what is the magnetic field’s strength? 0.042T 4) A student attempts to make a simple generator by passing a single loop of wire between the poles of a horseshoe magnet with a 2.5 × 10 −2 T field. The area of the loop is 7.54 × 10 −3 m 2 and is moved perpendicular to the magnetic field lines. In what time interval will the student have to move the loop out of the magnetic field in order to induce an emf of 1.5 V? 1.26x104 s 5) A rectangular coil 0.055 m by 0.085 m is positioned so that its crosssectional area is perpendicular to the direction of a magnetic field, B . If the coil has 75 turns and a total resistance of 8.7 Ω and the field decreases at a rate of 3.0 T/s, what is the magnitude of the induced current in the coil? 0.12A...
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 Fall '09
 Lyons
 Magnetic Field

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