Determine the pressure point in a liquid container within a pool. The height of the liquid column is 9 m, The density of the liquid is 997 kg/m^3, and gravity is 9.8 m/s^2.

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.