What multiple of the time constant τ gives the time taken by an initially uncharged capacitor in an RC series circuit to be charged to 81.5% of its final charge? Number Units

What multiple of the time constant τ gives the time taken by an initially uncharged capacitor in an RC series circuit to be charged to 81.5% of its final charge? Number Units

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What multiple of the time constant τ gives the time taken by an initially uncharged capacitor in an R C series circuit to be charged to 81.5 % of its final charge?
Number i Units

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