Lecture_16

# Lecture_16 - 22.5 Lenzs Law Remember Faradays Law M = N t...

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22.5 Lenz’s Law Remember Faraday’s Law: t N M Δ ΔΦ - = ε , where . cos φ BA M = Φ So a changing magnetic field can produce a current. What is the direction of this current? To get the direction, we must consider two magnetic fields: The first is the original one that produced the induced current. The second is the field created by the induced current itself. To determine the direction of the induced current flow, we use Lenz’s Law: The induced emf resulting from a change in magnetic flux leads to an induced current which produces a magnetic field to oppose the change in flux.

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xxxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx Example: Consider a single loop of wire sitting in the plane of the paper: Now turn on a magnetic field everywhere into the page: Then, in all of these Lenz’s Law problems, you have to ask yourself two questions: First, what is the direction of the magnetic flux ? In other words, what direction does the original magnetic field point. Here, it points into the page
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Lecture_16 - 22.5 Lenzs Law Remember Faradays Law M = N t...

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