Electromagnetic induction plays an important part in many of our leisure and transportation activities. In the light of this statement, answer the following.
(i) Can you convert the up and down hip movements to operate a cellphone?
(ii) How can you hunt a 'burried treasure' of a metallic kind?
(iii) The prices of gasoline are increasing sharply. Can electromagnetic induction help us in some way?
(iv) What lesson do you learn from the answers to these questions?