Because the ions forming the compound will have to separate from each other then. As a result, ionic compounds disintigrated into a myriad of single lonely ions floating free in water (in solutions). The process is known as electrolytic dissociation.
Eletric current is co-directed movement of particles exhibiting similar charge.
Water doesn't have charged particles constituting it. No electricity.
Ionic compounds do have charged particles (i.e. ions), but those are locked within the lattice and cannot move. No electricity.
Ionic compounds in water disintegrate into free floating (capable of moving) ions (charged particles). All you have to do is get all the positive charges moving one way and all the negative ones moving the other and here you have it - electricity! That is achieved through applying external magnetic field.
This is why ionic compunds can conduct electricity when dissolved in water or melted.
The amount of gravity is directly proportional to the amount of mass of the objects and inversely proportional to the square of the distance between the objects. Gravity is a force that increases the velocity of falling objects - they accelerate.
