Two coils are taken. first one is connected to the battery and the second one is connected to a galvanometre. when u change the polarity of the battery rapidly. the galvanometre gives a deflection in left and right alternatively. why??
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When key is closed galvanometer will show a momentary deflection due to produce of induced current due to change in magnetic field lines .
And when key is opened again a momentary deflection will be seen but at opposite direction due to again a change in magnetic fields.
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Answer:
when key is closed to the galvano meter will show a momentar deflection due to produce of induced current due to change in the magnetic field lines
and when key is opened against a momentary deflection will be but at opposite direction due to again a charge in the magnetic field.
Hope it will help you dear.and make me branily
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