Lecture23 - Lecture 23 Chapter 23 Faradays Law dA B B...

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1 Lecture 23 Chapter 23. Faraday’s Law dA B B Φ M B d A ε = d Φ M dt Moving charges make magnetic fields Magnetic fields affect moving charges Time varying magnetic field can produce electric field! (magnetic induction) Electric and Magnetic Fields Electric and magnetic fields are interconnected 4/12/11 3 Induction: DEMONSTRATION ammeter *Current flows only if there is relative motion between the loop and the magnet *Current disappears when the relative motion ceases *Faster motion produces a greater current Caution – this picture is not an example of right hand rule! 4/12/11 4 Induction Effects v v S N v N S N S Bar magnet moves through coil: Current induced in coil Change pole that enters: Induced current changes sign Bar magnet stationary inside coil: No current induced in coil Coil moves past fixed bar magnet: Current induced in coil S N Change direction of motion in any of above examples Induced current changes sign
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2 Solenoid: inside d NI B 0 μ = outside 0 B Constant current: What if current is not constant in time? Let B increase in time
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