An MRI uses a large magnetic field (as well as radio waves) to create images of...
An MRI uses a large magnetic field (as well as radio waves) to create images of a person's body. One such MRI designed for full-body scans includes a large solenoid with 1×105 turns that is 0.95 m long. The solenoid is meant to draw a current of 9 A , and when it starts, it takes 5 seconds for the solenoid to reach that current from zero.
Part A: A patient inside the MRI is wearing a gold ring with a radius of 3mm. If that ring is perpendicular to the magnetic field created by the solenoid, what is the magnitude of the emf induced in the ring during the first 5 seconds (as the solenoid gets up to its operating current)?
Part B: What is the magnitude of the emf induced in that ring after the first 5 seconds, when the current in the solenoid becomes constant?
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