All of the following explains why scientific discovery a never-ending effort except?There are still many unanswered phenomenon. Scientists still need to find method to create a perfect organism. Scientists have yet to discover other life forms in other planets. There are still new discoveries being made.

newton's first law of motion

because if the tool that you are using is not balanced it there would be false mass.

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.