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A certain circuit consists of a DC sourc...

A certain circuit consists of a DC source with emfan induction coil `L1`, and a key `K1`. No resistance is present in the circuit. Another coil, `L2`, which is connected electrically to a resistor R through a key `K2`, is fastened to `L1`. At some moment in time key `K1` is closed. After a certain tirne interval `K2` is closed. flow do the current in the primary circuit (the one containing), the induction emf in the secondary circuit (the one with `L2 and R`), and the current in the secondary circuit vary with time ?

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