Th b rotate the loop a faradays law rr db emf dl e dt

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Unformatted text preview: Φ B = ∫ B ×dA In P ra c tic a l Wo rd s : 1 ) Wh e n th e flux ΦB th ro ug h a lo o p c h a ng e s , a n emf is induced in the loop. th B Rotate the loop A Fa ra d a y’s La w rr dΦB emf = Ñ ×dl = − ∫E dt rr Φ B = ∫ B ×dA In P ra c tic a l Wo rd s : 1 ) Wh e n th e flux ΦB th ro ug h a lo o p c h a ng e s , a n emf is induced in the loop. th B Rotate the loop A Faradays Law rr dΦB emf = Ñ ×dl = − ∫E dt rr Φ B = ∫ B ×dA In P ra c tic a l Wo rd s : 1 ) Wh e n th e flux ΦB th ro ug h a lo o p c h a ng e s , a n emf is induced in the loop. th 2) The emf will make a current flow if it can (like a battery). I Demo Fa ra d a y’s La w rr dΦB emf = Ñ ×dl = − ∫E dt rr Φ B = ∫ B ×dA In P ra c tic a l Wo rd s : 1 ) Wh e n th e flux ΦB th ro ug h a lo o p c h a ng e s , a n emf is induced in the loop. th 2) The emf will make a current flow if it can (like a battery). 3) The current that flows induces a new magnetic field. I Faradays Law rr dΦB emf = Ñ ×dl = − ∫E dt rr Φ B = ∫ B ×dA In Practical Words: 1) When the flux ΦB through a loop changes, an emf is induced in the loop. through a loop changes, an 2) The emf will make a current flow if it can (like a battery). 3) The current that flows induces a new magnetic field. 4) The new magnetic field opposes the change in flux th a t c re a te d it. B dB/dt Faradays Law rr dΦB emf = Ñ ×dl = − ∫E dt rr Φ B = ∫ B ×dA In P ra c tic a lWo rd s : 1 ) Wh e n th e flux ΦB th ro ug h a lo o p c h a ng e s , a n emf is induced in the loop. th 2) The emf will make a current flow if it can (like a battery). 3) The current that flows induces a new magnetic field. 4) The new magnetic field opposes the change in the original magnetic field. B Demo dB/dt Fa ra d a y’s La w rr dΦB emf = Ñ ×dl = − ∫E dt rr Φ B = ∫ B ×dA Executive Summary: emf→current→field a) induced only when flux is changing only flux b) opposes the change opposes BB P re flig h t 2 • Motional emf is ZERO • v X B = 0 • no charge separation • no E field • no emf • The flux is NOT changing • B does not change • the area does not cha...
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This document was uploaded on 02/13/2014.

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