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rotation. Thus, the direction of current changes once in every rotation. Due to this, the, electric generator usually produces alternate current, i.e. AC. To convert an AC generator, into a DC generator, a split ring commutator is used. This helps in producing direct current., , - 7, A a clases, , & Generating Current, , , , , , , , , 18. Electro Magnetic Induction: Can be explained by two experiments, , (a) First Experiment — “Self Induction”, , [BOTT BS, , In this experiment, when the north pole of bar magnet is brought closer to the coil or away, from the coil, we see momentary deflection in the needle of galvanometer on either side of, null point. First right and then left., , Similarly, if we keep the magnet stationary and coil is made to move towards or away from, the north pole of magnet. Again we will observe deflection in the needle of galvanometer., , If both bar magnet and coil are kept stationary, there will be no deflection in galvanometer., This experiment can also be done with the south pole of magnet, we will observe the, deflection in galvanometer, but it would be in opposite direction to the previous case., , => It concludes that motion of magnet with respect to coil or vice-versa, changes the, magnetic field. Due to this change in magnetic field lines, potential difference is induced in, the same coil, which set up an induced current in the circuit., , (b) Second Experiment : Mutual Induction