another one
source:popularmechanics.com
Electricity may protect tanks more effectively than steel, ceramics
or outward-exploding reactive armor. Army scientists are
investigating two technologies. Both use a fiberoptic sensor to
detect when a round has struck, and then respond by turning on
electricity. In one approach, the current alters the thickness of a
special shape-memory alloy, thereby increasing its resistance to
penetration. The second method, shown above, uses electricity to
create a powerful magnetic field. The magnetic force pulls apart
the concentrated jet of metal created when a round strikes a tank's
armor. Instead of streaming into the tank, the molten metal expands
and dissipates harmlessly. Specifics of both projects remain
classified.
