7) A ball is dropped from the top of a building at point Y. If the ball is dropped a second time, from a height of
what happens to
the potential energy of the ball at the new height?
A)
It doubles.
B)
It stays the same.
It increases by one half
D)
It decreases by one half.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.