My neighbor opened the tuner circuit of his radio and, Ask an Expert

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My neighbor opened the tuner circuit of his radio and noticed that it uses a 4.5 microHertz inductor together with a variable capacitor that ranges from 0.32 picoFarad to 1.28 picoFarad.

1. What is the highest frequency that his radio can tune in?

A circular coil of radius 6.0 cm has 1500 turns and a total resistance of 0.25. Initially it is in a region with a uniform magnetic field of 0.25 T perpendicular to the coil area. The coil is removed from the region of magnetic field in a time of 50.0 microseconds.

1. Find the average emf induced in the coil.

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