In this paper we obtain two exact internal controllability results ofMaxwell's equations in a general region by using multiplier techniques. The firstone is exact controllability in a short time, in which we obtain the "optimal" (observability)estimates when the location and the shape of the controller is fixed. Whathappens if we allow the controller to change? Under some conditions, we show thatby doing that the system can be exactly controllable within any given time duration,which is our second exact controllability result.