25 RL - Summary of Lecture 24 Mutual induction two coils...

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Craig Ogilvie 11 Summary of Lecture 24 § Mutual induction two coils change current in one, changes flux in other => induce emf magnitude of emf given by ε2 = - M di1/dt M is mutual inductance, solely depends on geometry § Single solenoid/coil, inductor change current in a coil, B-field changes, flux changes » emf induced, ε = - L di/dt » always acts to oppose change » visual, imagine temporary “battery” at place of inductor
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Craig Ogilvie 22 Goals For Today § Calculate inductance, L § Use of inductors in circuits
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Craig Ogilvie 33 Question: Inductor emf, 1st round § In the circuit shown, the voltage in the power supply is turned down, so that the current decreases § During this operation which point, y or z, is at a lower potential 1. y lower potential 2. z lower potential 3. Both at the same potential Hint: figure out how to oppose change 1 of 300
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Craig Ogilvie 44 Question: Inductor emf, 2nd round 0% 100% 0% 0% 100% 0% 1 2 3 § In the circuit shown, the voltage in the power supply is turned down, so that the current decreases § During this operation which point, y or z, is at a lower potential Hint: figure out how to oppose change By Lenz law induced emf tries to oppose change. Current is decreasing so emf tries to increase it.
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25 RL - Summary of Lecture 24 Mutual induction two coils...

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