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A series R-C combination is connected to...

A series R-C combination is connected to an AC voltage of angular frequency `omega=500 radian//s`. If the impendance of the R-C circuit is `Rsqrt(1.25)`, the time constant (in millisecond) of the circuit is

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The correct Answer is:
B,C
`R sqrt(1.25) = sqrt(R^(2) + X_(C )^(2))`
`X_(C ) = (R )/(2)`, hence `RC = (2)/(omega) = 4 ms`
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