Mastering Physics: CH 21 H... x C A Closely wound Rectangu x C Home I Chegg.com

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Mastering Physics: CH 21 H... x C A Closely wound Rectangu x C Home I Chegg.com x a motional emf induced in the rod? A V E https://session masteringphysics.com 77056563 PHYS 112 003 Help I Close Resources CH 21 HWB PhET Tutorial: Faraday's Law e previous I 1 of 7 l next Part A Faraday's law of induction deals with how a magnetic flux induces an emf in a circuit. Recall that magnetic flux depends on magnetic field strength and the effective area the field is passing through. We'll start our investigation by looking at the field strength around a bar magnet. Position the magnet around the coil so that the region labeled A in the figure below is inside the coil. Move the magnet slowly back and forth and observe the effect on the brightness of the bulb and the needle of the voltmeter. Repeat the same process for the other two regions. N S For which of the regions shown in the figure is the observed effect the strongest? Region A Region C Region B The observed effect is the same for all three regions.

Explanation / Answer

part D ) The bulb shines more brightlyis the correct answer. As the magnet is approaching a coil the magnetic flux is increasing since the field strength is stronger closer to closer to the magnet.The faster the magnet approaches, the quicker the flux increases, which causes a geat emf and current.

part E ) Switching the polarity of the magnet has no effect on bulb brigthness but inverts the order of the needle deflection in voltmeter.

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