Is the steady current the only source of magnetic field? Justify your answer.

List three sources of magnetic field.

List three sources of magnetic field.

Fig. shows the electric field lines arround three point charges A, B and C. In which region or regions of the picture could the electric field be zero? Justify your answer.

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. Justify your answer.

Say true or false and justify your answer: 2^3>5^2

It is established that an electric current through a metallic conductor produces a magnetic field around it. It there a similar magnetic field produced around a thin beam of moving neutrons? Justify your answer.