1.

In the question number 42, the time lag between the current maximum and the voltage maximum is

Answer»

`15.5 ms`
155 ms
`1.55 ms`
`1.55 s`

Solution :In series RC circuit voltage lags behind the current by PHASE ANGLE `phi`.
Then, `tan phi = (X_(C ))/(R )=(1//omega C)/(R )=(1)/(omega CR)=(1)/(2pi upsilon CR)`
`tan phi = (1)/(2pixx60xx10^(-4)xx40)`
`tan phi=(0.6634), phi = tan^(-1)(0.6634)`
`=33.56^(@)=33.56xx(pi)/(180)` RAD
`therefore` Time LAG, `Delta t = (phi)/(omega) = (180)/(120 pi)=1.55xx10^(-3)s "" [because omega 2pi upsilon = 120 pi)`
`= 1.55 ms`


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