With the hwlp of an activity explain the method of inducing electric current in the coil with a moving magnetstate the rule used to find direction of electric current thus generated in the coil
Answers
Take a coil of wire AB having a large number of turns .connecting the ends of the coil to a galvanometer as shown in below attached figure. Take a strong bar magnet and move its north towards the end B of the coil.
Do you find any change in galvanometer needle ?
Yeah, there is a momentary deflection in the needle of the galvanometer. This indicates the presence of a current in the coil AB. The deflection becomes zero the moment of the motion of the magnet stops.
Now, Let’s withdraw the North Pole of the magnet away from the coil , now we see, galvanometer is deflected towards left. Showing that current is now set up in the direction opposite to the first.
Place the magnet stationary at the point near to the coil, keeping its North Pole towards the end B of the coil. We see that the galvanometer needle deflects towards the right when the coil is moved towards the North Pole of the magnet . Similarly the needle is moved towards the left when the coil is moved away.
But when the coil is kept stationary with respect to the magnet The deflection of the galvanometer drops to zero.
Here it is clear that,motion of a magnet with respect to the coil produces an induced potential difference,which set up an induced electric current in the circuit. Actually this beautiful concept is given by great scientist Michael Faraday he gave us a most important concept electromagnetic induction.
The method of inducing an electric current in a coil with a moving magnet and the rule to find direction of the of electric current thus generated in the coil is given by
>take a nail and coil the conducting wire around it many times ,connect the ends of the coil to a galvanometre take a strong magnet and bring it closer to the ends of the coil that is point B and notice the change on the galvanometer