Question

(1) What is the needle of a compass attracted to?

(2) What is the difference between ferromagnetic  and magnetic?

(3) In terms of electrons, what causes permanent magnetism?

(4) What is the technique in making synthetic magnets?                                                      

Answer 1

1) a compass needle is attracted to the opposite electrical charges of Earth's poles, with the tip of its needle always pointing north and the bottom of its needle always pointing south.

2) "Ferro", ferrous, are specifically iron based materials. "Magnetic" can be anything, such as rare earth types like samarium-cobalt, which also includes iron based

3) Magnetism is caused by electric charges in motion. Since electrons in atoms are known to move in certain ways, they are able to produce their own magnetic fields. In some types of materials, the motions of atomic electrons are easily aligned with respect to one another, causing an overall magnetic field to be produced by the material.

4) Artificial magnets are generally madefrom special iron or steel alloys which are usually magnetizedelectrically. The material to be magnetized is inserted into acoil of insulated wire and a heavy flow of electrons is passedthrough the wire. Magnets can also he produced by stroking amagnetic material with magnetite, or with another artificialmagnet. The forces causing magnetization are represented bymagnetic lines of force, very similar in nature to theelectrostatic lines of force