Arnold pushes straight up on a 130-kilogram weight with a force of 1,500 N. Which of the following diagrams shows the net force acting on the weight? Assume the acceleration due to gravity is 10.0 m/s/s.

amplitude

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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.