Figure shows planar loops of different shapes moving out of or into a region of a magnetic field which is directed normal to the plane of the loop away from the reader. Determine the direction of induced current in each loop using Lenz's law.

Explanation

(i) Here, as the given loop enters given magnetic field, inward magnetic flux increases and so induced current should cause outward magnetic flux to oppose the increase in flux, according to Lenz.s law. For this induced current should flow in anticlockwise direction. i.e. along the path `atobtocto d to a`.
(ii) Here, as the given loop exits given magnetic field, inward magnetic flux decreases and so induced current should cause inward magnetic flux (to oppose the decrease in flux, according to Lenz.s law). For this, induced current should flow in clockwise direction, i.e. along the path `atoctobtoa`.
(iii) Here, as the given loop exits given magnetic field, inward magnetic flux decreases and so induced current should cause inward magnetic flux (to oppose the decrease in flux, according to Lenz.s law). For this, induced current should flow in clockwise direction. i.e. along the path `a to b to c to d to a`.