Question 10 of 10 Which feature of electromagnets makes them more useful than permanent

magnets in many modern technologies?

A. The current can be adjusted to control the strength of the

magnetic field.

B. Electromagnets are not dependent on a power supply.

C. Electromagnets cannot be turned on and off.

D. The strength of the magnetic field is more consistent in

electromagnets

answer; how far out of place which the object finished relative to the starting location;

answerdmitry mendeleyev made a workable classification of the elements

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.