In each of the following situations, both samples start at a temperature of 5°C and are placed in a room where the temperature of their surroundings is 25°C. For each situation, decide which sample you think will reach room temperature first. Explain your reasoning.

you have to draw the persons position over there

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.