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When the current in the portion of the c...

When the current in the portion of the circuit shown in the figure is 2 A and increasing at the rate of `1As^(-1)`, then the measured potential difference `V_(ab)=8V`.
However, when the current is 2 A and decreasing at the rate of `1As^(-1)`, then the measured potential difference `V_(ab)=4V`.
The values of R and L are

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