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206. assignment (induction)

A circular metal ring is suspended above a solenoid. The magnetic field due to the solenoid is shown in the figure below . The current in the solenoid is increasing.

(a) What is the direction of the current in the ring?

(b) The flux through the ring is proportional to the current in the solenoid. When the current in the solenoid is 12.0 A, the magnetic flux through the ring is 0.40 Wb. When the current increases at a rate of 240 A/s,

what is the induced emf in the ring?

(c) Is there a net magnetic force on the ring? If so, in what direction?

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