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In an experimental arrangement of two coils C1 and C2 placed coaxially parallel to each other, find out the expression for the emf induced in the coil C1 (of N1 turns) corresponding to the change of current I2 in the coil C2 (of N2 turns).

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Let φ1 be the flux through coil C1 (of N1 turns) when current in coil C2 is I2 . Then, we have 

N1φ1 = MI2 ....(i)

For current varying with time,

It shows that varying current in a coil induces emf in the neighbouring coil.

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