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lec12_ddn(2x2) - Lecture 12 Electrostatics motion of"q in...

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Lecture 12 • Electrostatics • motion of “ q ” in external E-field • E-field generated by q • Magnetostatics • motion of “ q ” and “ I ” in external B-field • B-field generated by “ I • Electrodynamics • time dependent B-field generates E-field –ac circuits, inductors, transformers, etc –time dependent E-field generates B-field 10/2/11 2 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! 10/2/11 3 Induction Effects from Currents a b Conclusion: A current is induced in a loop when: there is a change in magnetic field through it. This can happen many different ways. How can we quantify this? When the switch is closed (or opened) ! current induced in coil b Steady state current in coil a ! no current induced in coil b 10/2/11 4 Faraday’s Law
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