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Summary 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 Calculating flux through an area in a B-field: B F A ; F = BA FBAcosq
Summary (Cont.) Lenz’s law: An induced current will be in such a direction as to produce a magnetic field that will oppose the motion of the magnetic field that is producing it. Induced B Left motion Induced B I Right motion I N Flux increasing to left induces loop flux to the right. S N Flux decreasing by right move induces loop flux to the left. S
- 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 and 8: Example 1: A current loop has an ar
- Page 9 and 10: Example 2: A coil has 200 turns of
- 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: Example 6: A series-wound dc motor
- Page 27 and 28: Summary (Cont.) The ac generator is
- Page 29: CONCLUSION: Chapter 31A Electromagn
Summary (Cont.)<br />
Lenz’s law: An induced current will be in such a direction<br />
as to produce a magnetic field that will oppose the<br />
motion of the magnetic field that is producing it.<br />
Induced B<br />
Left motion<br />
Induced B<br />
I<br />
Right motion<br />
I<br />
N<br />
Flux increasing to left induces<br />
loop flux to the right.<br />
S<br />
N<br />
Flux decreasing by right move<br />
induces loop flux to the left.<br />
S
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