Is the current in the wire from A to B or B to A?

University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
Publisher:OpenStax
Chapter13: Electromagnetic Induction
Section: Chapter Questions
Problem 70AP: A circular loop of wire of radius 10 cm is mounted on a vertical shaft and rotated at a frequency of...
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A horizontal wire is free to slide on the vertical rails of a conducting frame, as in the figure. The wire has a mass (m) and length (l), and the resistance of the circuit is R.

a) If a uniform magnetic field is directed perpendicularly to the frame, out of the paper, what is the the terminal (final) speed of the wire as it falls under the force of gravity? (Neglect friction)

 

b) Is the current in the wire from A to B or B to A? [Explain your answer]

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