Which of the following has the greatest density? a) a 10 g object with a volume of 10 cubic centimeter. b) a 40 g object with a volume of 20 cubic centimeter. c) a 20 g object with a volume of 5 cubic centimeter. d) a 10 g object with a volume of 2 cubic centimeter.

well clustered together.

points close on a scatter diagram

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.