If a chain of 35 identical short springs linked end-to-end has a stiffness of 240 N/m, what is the stiffness of one short spring

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator

answergravity;

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.