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A closed circuit consists of a source of...

A closed circuit consists of a source of constant `emf E` and a choke coil of inductance `L` connected in series.The active resistance of the whole circuit is equal to `R`.It is in steady state.At the moment `L=0` the choke coil inductance was decreased abruptly `4` times.The current in the circuit as a function of time `t` is `E/R[1-xc^(-4tR//L)]`.Find out value of `x`.

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