wire parallel to the paper moves downward into a flux density directed into the paper. The induced current will be ... a) directed to the left b) directed to the right c) zero because the motion is parallel to the field d) opposite to the induced emf, according to Lenz's law.
Question
wire parallel to the paper moves downward into a flux density directed into the paper. The induced current will be ... a) directed to the left b) directed to the right c) zero because the motion is parallel to the field d) opposite to the induced emf, according to Lenz's law.
Solution
The answer is a) directed to the left.
Here's the step-by-step explanation:
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According to Faraday's law of electromagnetic induction, a change in magnetic flux through a loop of wire induces an electromotive force (emf) in the wire.
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Lenz's law, which is a part of Faraday's law, states that the induced emf and hence the induced current in a loop is in such a direction as to oppose the change in magnetic flux that produced it.
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In this case, the wire is moving downward into a magnetic field directed into the paper. This increases the magnetic flux through the loop formed by the wire.
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To oppose this increase in flux, the induced current will create its own magnetic field directed out of the paper.
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Using the right-hand rule, which states that if the thumb of the right hand points in the direction of the motion of the positive charge or current and the fingers in the direction of the magnetic field, then the palm points in the direction of the force, we find that the current must be directed to the left.
So, the induced current will be directed to the left.
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