Current mirror Configuration using BJT application
Now in order to get the collector current in mA, only a small amount of uA current is required


In one model of transistor operation, the base current controls the collector current. I'm concerned that you might be thinking that the base-current somehow creates collector current - it doesn't. You could think of it as the base current operating a valve that lets through collector current. All the current has to come (ultimately) from your power source.


  using 0.15uF cap which gives upto 11mA currnt


Capacitors of a certain capacitance don't really have a specific current associated with them. There may be a maximum current they can safely deliver but that is likely to be a lot more than 11 mA for all but the tiniest capacitors. In essentially DC applications, the current flowing out of a capacitor depends on the voltage to which the capacitor has been charged, the resistance of the load and the current decays exponentially over time as the stored energy is release and the voltage drops.