Question

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

Answer 1

Correct Answer - B,C
`R sqrt(1.25) = sqrt(R^(2) + X_(C )^(2))`
`X_(C ) = (R )/(2)`, hence `RC = (2)/(omega) = 4 ms`