A 22 kg child is sledding on a slope with an acceleration of 2.6 m/s^2. What is the pitch of the slope (angle measured in degrees)? (include units and correct number of significant figures) (ignore any friction)

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.