Giancoli's Physics: Principles with Applications, 6th Edition
21
Electromagnetic Induction and Faraday's Law
Change chapter21-1 to 21-4: Faraday's Law of Induction
21-5: Generators
21-6: Back EMF and Torque
21-7: Transformers
21-9: Inductance
21-10: Magnetic Energy Storage
21-11: LR Circuit
21-12: AC Circuits and Reactance
21-13: LRC Circuits
21-14: Resonance in AC Circuits
Problem 16
A
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COMMENTS
By mbnoroozi on Sun, 2/25/2018 - 10:51 PM
Hi Dr. Dychko - I might be missing something obvious but can you explain why the final answer is negative?
Thanks!
By Mr. Dychko on Tue, 2/27/2018 - 4:54 AM
Hi mbnoroozi, thanks for the question. The final answer I have is positive, but I think you're referring to the negative in the formula for the induced EMF? That negative is there to remind us that the induced EMF causes a current directed such that it produces a magnetic flux in the coil that opposes the change in flux that caused the EMF in the first place. Negative in this case can be thought of as "opposite to", in the same way as a car going in the opposite direction to a car with velocity 30 m/s will have a velocity -30 m/s.
Hope this helps,
Mr. Dychko
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