Exercise 29.2 In a physics laboratory experiment, a coil with 210 turns enclosin
ID: 1291795 • Letter: E
Question
Exercise 29.2 In a physics laboratory experiment, a coil with 210 turns enclosing an area of 12.2cm^2 is rotated in a time interval of 3.50x10^-2s from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The earth's magnetic field at the lab location is 5.9x10^-5 T. What is the total magnetic flux through the coil before it is rotated? Phi 1 = Part B What is the total magnetic flux through the coil after it is rotated? Phi 2 = Part C What is the average emf induced in the coil?Explanation / Answer
magnetic flux phi = NAB cos theta
phi = 210 * 12.2 e-4 * 5.9 e-5
phi = 1.511*10^-5 Wb
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after rotating angle = 90 deg and as cos 90 =0
flux phi = 1.511 e-5 Wb
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induced emf e = d(flux(/dt
emf e = 1.511e-5/(3.5e-2)
emf e = 0.431 mV
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