In order to be considered an ion, an atom must have a
a. positive charge
b. charge
c. negative charge
d. neutral charge

In order to be considered an Ion, an Atom just has to have a Charge, so B.)Charge is the correct answer, and I just took the test and got it correct.

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.