A wire carrying a current is shaped in the form of a circular loop of radius 3.0mm. If the magnetic field strength that this current produces at the center of the loop is 1.1mT a) what is the magnitude of the current that flows through the wire? b) If more wire is fed into the loop so that it remains circular and the magnetic field strength at its new center is 0.25mT (assuming negligible change in current), how much wire was fed into the loop?

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Chapter1: Units, Trigonometry. And Vectors
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A wire carrying a current is shaped in the form of a
circular loop of radius 3.0mm. If the magnetic field
strength that this current produces at the center of the
loop is 1.1mT a) what is the magnitude of the current that
flows through the wire? b) If more wire is fed into the
loop so that it remains circular and the magnetic field
strength at its new center is 0.25mT (assuming negligible
change in current), how much wire was fed into the
loop?
Transcribed Image Text:A wire carrying a current is shaped in the form of a circular loop of radius 3.0mm. If the magnetic field strength that this current produces at the center of the loop is 1.1mT a) what is the magnitude of the current that flows through the wire? b) If more wire is fed into the loop so that it remains circular and the magnetic field strength at its new center is 0.25mT (assuming negligible change in current), how much wire was fed into the loop?
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