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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:
4
`1.25R^(2)=R^(2)+(1/(omegaC))^(2)`
`0.25 R^(2)=(1/(omegaC))^(2) Ϸ RC=1/250 sec`
`tau=4 millisecond, tau=4`
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