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A circular conducting wire hoop is held horizontally. A bar magnet is held above it as shown.
Created for Albert.io. Copyright 2016. All right reserved.
Which of the following diagrams best represents a scenario where any induced current ($I$) will never change direction?
By moving the magnet down, with the South pole facing the hoop.
By moving the magnet up, with the South Pole facing the hoop.
By holding the bar magnet stationary and lifting the hoop straight up (the hoop remains horizontal).
By holding the bar magnet stationary, and rotating the hoop (on a horizontal axis) below it.