The magnetic flux linked with a large circular coil of radius R is 0.5 xx 10^(-3) Wb, when current of 0.5A flows through a small neighbouring coil of radius r. Calculate the coefficient of mutual inductance for the given pair of coils. If the current through the small coil suddenly falls to zero, what would be the effect in the larger coil.

The magnetic flux linked with a large circular coil of radius R is 0.5

1.	The magnetic flux linked with a large circular coil of radius R is 0.5 xx 10^(-3) Wb, when current of 0.5A flows through a small neighbouring coil of radius r. Calculate the coefficient of mutual inductance for the given pair of coils. If the current through the small coil suddenly falls to zero, what would be the effect in the larger coil.
Answer» SOLUTION :`M = 1 m H`. If the current through small coil suddenly FALLS to zero, [ as , `e_2= - M (di_1)/(dt)`] so initially large current is induced in larger coil, which soon BECOMES zero.

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