Magnetism (part 9)

# Magnetism (part 9) - Magnetism Lecture 05 Electromagnetic...

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Magnetism Lecture 05: Electromagnetic Induction (Knight:33.1-33.4) x x x x x x x x x x x x x x x x x x v F B q → → → → → → → → → → v F B q × ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ v F = 0 B q B v q E q F × + =

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Physics 113 Dr. Renat Letfullin 2 Announcements: Cosmic Cinema Movie is Today in GM room
3 Magnetic Flux Lenz’s Law Today...

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Physics 113 Dr. Renat Letfullin 4 Flux How much of something is passing through some surface Ex: How many hairs passing through your scalp. Two ways to define 1.Number per unit area (e.g., 10 hairs/mm )
Physics 113 Dr. Renat Letfullin 5 Electric Flux: Field Perpendicular For a constant field perpendicular to a surface A A Electric Flux is defined as A | | E = Φ E

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Physics 113 Dr. Renat Letfullin 6 Electric Flux: Non perpendicular For a constant field NOT perpendicular to a surface A Electric Flux is defined as θ cos | | A E = Φ A E θ
Physics 113 Dr. Renat Letfullin 7 Air Flow and Flux eff cos cos A ab A θ θ = = Theamount of air flow through theloop depends on theorientation of theloop with respect to theair-flow direction.

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Physics 113 Dr. Renat Letfullin 8 Magnetic Flux Thenumber of arrows passing through theloop depends on two factors: (1) Thedensity of arrows, which is proportional to B
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