Created by StemPy LabA paramagnetic salt obeys Curie's law. At a temperature of , in a magnetic field of , its magnetisation is . The salt is cooled to and placed in a field of . Its new magnetisation is
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← The figure shows a bridge rectifier made of four ideal diodes, fed by a sinusoidal AC supply, with a load resistor RL. Diode D₃ has burnt out and now acts as an open circuit. Which graph shows the voltage across RL against time?Two long, smooth, horizontal conducting rails are a distance l apart and are joined at one end by a capacitor of capacitance C, as shown in the figure. A uniform magnetic field B is perpendicular to the plane of the rails. A rod of mass m lies across the rails, and a constant horizontal force F pulls it along them, starting from rest. The resistance of the rod and the rails is negligible. How does the rod move? →
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