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A current i(0) is flowing through an L-R...

A current `i_(0)` is flowing through an `L-R` circuit of time constant `i_(0)`. The source of the current is switched off at time `t = 0`. Let `r` be the value of `(-di//dt)` at time `t = 0`.Assuming this rate to be constant, the current will reduce to zero in a time interval of

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