Lenz's law gives us the direction of current induced in a circuit. According to this law, the polarity of induced e.m.f is always such that is opposes the change in magnetic flux responsible for its production. It means if e.m.f. is induced due to increase in magnetic flux, the direction of e.m.f. induced is such as to oppose the increase in magnetic flux. The reverse is also true.
Read the above passage and answer the following questions :
(i) Does Lenz's law violate the principle of conservation of energy ?
(ii) Name any other rule for finding the direction of induced current.
(iii) What does Lenz's law imply in day to day life?

Explanation

(i) No, Lenz's law does not violate the principle of conservation of energy.
(ii) Fleming's Right hand rule is yet another rule for finding the direction of induced current.
(iii) In day to day life, Lenz's law implies that you cannot ge something out of nothing. When we do mechanical work in moving the magnet towards/away from the coil, we obtain electrical energy in the form of induced current/e.m.f. The moment we stop moving the magnet, induced current/e.m.f. disappears. If we ignore stray losses, energy obtained is always equal to energy spent or work done.