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Application of Faraday’s Law Faraday’s Law: E= F -N t A change in flux F can occur by a change in area or by a change in the B-field: F = B A F = A B Rotating loop = B A n n Loop at rest = A B n
Example 2: A coil has 200 turns of area 30 cm 2 . It flips from vertical to horizontal position in a time of 0.03 s. What is the induced emf if the constant B-field is 4 mT? A = 30 cm 2 – 0 = 30 cm 2 F = B A = (3 mT)(30 cm 2 ) F = (0.004 T)(0.0030 m 2 ) N N = 200 turns n q B S F = 1.2 x 10 -5 Wb B = 4 mT; 0 0 to 90 0 E N F t -5 1.2 x 10 Wb (200) 0.03 s E = -0.080 V The negative sign indicates the polarity of the voltage.
Page 1 and 2: Electromagnetic Induction
Page 3 and 4: Induced Current When a conductor mo
Page 5 and 6: Magnetic Flux Density • Magnetic
Page 7: Example 1: A current loop has an ar
Page 11 and 12: Example 3: Use Lenz’s law to dete
Page 13 and 14: Motional EMF in a Wire Force F on c
Page 15 and 16: The AC Generator • An alternating
Page 17 and 18: Calculating Induced EMF Rectangular
Page 19 and 20: Example 5: An ac generator has 12 t
Page 21 and 22: The Electric Motor In a simple elec
Page 23 and 24: Example 6: A series-wound dc motor
Page 25 and 26: Summary (Cont.) Lenz’s law: An in
Page 27 and 28: Summary (Cont.) The ac generator is
Page 29: CONCLUSION: Chapter 31A Electromagn

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