17. (a) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet
is:
(i) pushed into the coil with its north pole entering first?
(ii) withdrawn from inside the coil?
(iii) held stationary inside the coil?
(b) Name the above phenomenon and mention the name of the scientist who discovered it. State the
law that relates the direction of current in the coil with the direction of motion of the magnet
Answers
Answer: i.) Current will get induced in the coil
ii) Again, current will get induced in the coil
ii) Current wouldn't get induced
b.) The phenomenon is known as the electromagnetic induction. ( meaning production or induction of electricity with the help of magnet). The name of the scientist who discovered it is Michael Faraday. And Faraday's law of induction is the law that relates this phenomenon
Explanation: In case of a.) And b.) I. E when the movement of magnet occurs, according to Faraday's law of induction ( I. E change in the magnetic field or the number of magnetic lines passing through the coil causes induction of current); there will be deflections in the galvanometer and current will get induced. But in case of c.), the magnet is stationary which means there is no change in magnetic field or the number of magnetic lines passing through it. Therefore there will be no current induced and no deflections will be seen in the galvanometer as well
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