Explain how the global sea surface temperature is affected by solar activity.

the ima (higher than 1m) will be greater than the ima with the height of 1m.

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.