Suppose that 2 J of work is needed to stretch a spring from its natural length of 36 cm to a length of 53 cm. A) How much work is needed to stretch the spring from 41 cm to 45 cm?B) How far beyond its natural length will a force of 30 N keep the spring stretched?

3.2x10^7

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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.

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