Magnetic field to induce an emf

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A coil of insulated wire is wound many times around an iron bar. The wire is connected to a battery and a contact switch. The contact switch is alternately flipped closed and left closed, so the wire carries a current through it, and then flipped open and left open, so that the current stops. Describe what magnetic fields are created, if those magnetic fields in turn induce an emf, and whether the induced emf is in the direction of the original current or opposite to it. Use Lenz's law to justify, and the conditions which can cause a magnetic field to induce an emf. If you could draw a diagram for visualization that would be great too.

Reference no: EM132431676

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