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A technician wearing a circular metal band on his wrist moves his hand into a uniform magnetic field of magnitude 2.5 T in a time of 0.18 s. If the diameter of the band is 6.5 cm and the field is at an angle of $45^{\circ}$ with the plane of the metal band while the hand is in the field, find the magnitude of the average emf induced in the band.

0.033 \mathrm{V}

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University of Washington

Hope College

University of Sheffield

McMaster University

OK, So induced Emma is given by no number of loops times the radio off. The time very rate of change are the rate of change of the magnetic flux Answer and is one here. So you have, um uh, whoops. And is one. So you have not for Fei. You have magnetic fields during times. Area A over Delta two on. So you plug in values here 2.5 Tesla's The given magnetic field strength area is pi r squared ours half of 6.5 centimeters. So that's point 03 to 5 meters or 2.25 centimeters. Uh, that's square times Pi Grissom area by that, by the time taken with this 0.100 seconds gives you approximately 33 Millie volts are 0.33 votes.