Question

The diagram in Fig. shows a coil of several turns of copper wire near a magnet NS. The coil is moved in the direction of arrow shown in the diagram.
(i) In what direction does the induced current flow in the coil ?
(ii) Name the law used to arrive at the conclusion in part (1).
(iii) How would the current in coil be altered if (a) the coil has twice the number of turns, (b) the coil was made to move three times fast ?

Answer 1

(i) Current flows towards B to A in the coil.

using len'z law $e=-\frac{d\theta }{dt}where\theta =fluxassociated$

(ii) Lenz's law is used to draw the above conclusion
(iii) (a) Current becomes twice
(b) Current becomes thrice