A space station with a mass of 56000 kg is in orbit around the earth at an altitude above the surface of the earth that is equal to 4 times the earths radius. What acceleration due to the earths gravity would an astronaut on that space station experience to.

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i just did this and got a 100.

yup its correct its: c) b b

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.