Which dog has the most kinetic energy? A. A dog of mass 11 kg running with speed 5 m/s
B. A dog of mass 13 kg running with speed 3 m/s
C. A dog of mass 14 kg running with speed 2 m/s
D. A dog of mass 12 kg running with speed 4 m/s

you can cut your hand off if your not

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.