in general, the of a simple machine is the ratio of the distance over which the force is applied to the distance over which the load is moved.
a. mechanical advantage.
b. energy.
c. efficiency.
d. power.

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.

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