Spiderman, whose mass is 72.0 kg, is dangling on the free end of a 12.8-m-long rope, the other end of which is fixed to a tree limb above. By repeatedly bending at the waist, he is able to get the rope in motion, eventually getting it to swing enough that he can reach a ledge when the rope makes a θ = 61.6° angle with the vertical. How much work was done by the gravitational force on Spiderman in this maneuver?

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the answer is a. hope this .

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.