Question

The root cause of magnetic properties in substance is
Alorbital motion of electron
B) spin motion of proton
C) orbital and spin motion of electron D) orbital and spin motion of proton​

Answer 1

Assertion is correct but Reason is incorrect

In an atom, electrons revolve around the nucleus and as such the circular orbits of electrons may be considered as the small current loops. In addition to orbital motion, an electron has got spin motion also. So the total magnetic moment of electron is the vector sum of its magnetic moments due to orbital and spin motion. Charge particles at rest do not produce electric field.

Answer 2

Explanation:

Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. Each atom has electrons, particles that carry electric charges. ... In substances such as iron, cobalt, and nickel, most of the electrons spin in the same direction.