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Question:

Predict the direction of induced current in metal rings 1 and 2 when current I in the wire is steadily decreasing?

Solution:

By Right hand thumb rule the direction of magnetic field through ring 1, due to current in wire will be perpendicular inward into the plane of paper. Now according to Lenz's law, as the current is decreasing in wire, the direction of induced current in ring 1 will be such that, it should oppose the decrement of current in wire, for that upper face of ring 1 will be a south pole. If upper face is south then direction of current in ring 1 is clockwise. Due to same reason the direction of induced current in ring 2 will be anticlockwise.