How are electromagnets different from regular magnets?
They can be turned on and off.
Their polarity can be reversed.
Their strength can be changed.
All of the above.
None of the above.

small = small current large mag large current

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

answercollision;