The coercive force is defined to be the applied magnetic field needed to bring B?back to zero along the hysteresis curve (point c?in Figure). For a certain permanent bar magnet, the coercive force B_app = 5.53 ? 10^?2 T. The bar magnet is to be demagnetized by placing it inside a 15-cm-long solenoid with 600 turns. What minimum current is needed in the solenoid to demagnetize the magnet?

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P, Br Buye dde. P2