to look at something really interesting:
Researchers at the Defence Science and Technology Laboratory (Dstl), which is the research and development arm of the Ministry of Defence, claim it is possible to incorporate material known as supercapacitors into armour of a vehicle to turn it into a kind of giant battery.
When a threat from incoming fire is detected by the vehicle, the energy stored in the supercapacitor can be rapidly dumped onto the metal plating on the outside of the vehicle, producing a strong electromagnetic field.
Scientists behind the project claim this would produce a momentary "force field" capable of repelling the incoming rounds and projectiles.
So in best case(I'm thinking) the field could deflect, say, an RPG round so it misses, or- actually also a best case- fry the fuse so it won't fire, which means dud bouncing off the armor. Very nice idea.