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u said M21 depends on the geo of th second coil also the other. so how can it be equals to each other while their geo is no equal? pls give me an exponation
Mutual inductance is like a resultant of both these quantities For example if coil 1 has N turns and coil 2 has M turns The M21 will depend on product of the turns ie.. MN Hence it will be same
If u move the second coil the flux decrease ok.. But the rate of change of flux is same as that u move it towards the first coil.. So why the brightness of the bulb decrease?