82. A 25-turn 12.5-cm-diameter coil is placed between the
Chapter 21, Problem 82(choose chapter or problem)
82. A 25-turn 12.5-cm-diameter coil is placed between the pole pieces of an electromagnet. When the magnet is turned on. the flux through the coil changes, inducing an emf. At what rate (in T/s) must the field produced by the magnet change if the emf is to be 120 V?
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