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The circuit shown in the figure is initially in the steady state with the switch 
in open condition and 
in closed condition. The switch is closed and is opened simultaneously at the instant 
, where 
. The minimum value of 
in milliseconds, such that there is no transient in the voltage across the 
capacitor, is (Round off to 2 decimal places).
Before t = t1 Kcs open & 
is closed & circuit reaches steady state
The current of 5V dc source keeps circulating in a loop & does not affect capacitor.
at t = t1, 
after t = t1 k closed so ac current source is shorted & is open so a series RC circuit with 5V dc source is formed.
Initial capacitor voltage 
Steady state capacitor voltage = 5V
Second term represents transient
For transient-free response
