PhysicsHardHigh School (11–12)Electricity & Magnetism › Electromagnetic InductionBoard ExamAPA-LevelIB
Created by StemPy LabA rectangular coil of turns measures cm by cm. It starts with its normal along a uniform field of T, and it is turned so that its normal is at to the field in s. What is the average emf?
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← Coil A is wound of copper wire. Coil B has the same size and the same number of turns, but it is wound of a wire of much higher resistance. The same magnet is pushed into each at the same speed. Compare what happens.A thin metal disc lies at right angles to a field that changes at a steady rate. Eddy currents heat the disc at 3.3 W. A second disc is made of the same metal. It has twice the radius and a quarter of the thickness, and lies in the same changing field. At what rate is it heated? →
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