When a soft iron rod is inserted into the coils, what will be the change observed in the
brightness of bulbs A and B which is connected to a 6v AC and 6 v DC respectively ?
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there will be no change in brightness of the bulb DC since DC dosent creates changing magnetic flux due constant current
there will be increase in brightness of bulb A since it is connected in AC it will produce changing magnetic flux leading to more induced current on inserting the soft iron which causes the change in magnetic flux at a greater rate
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