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InterviewSolution
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The magnetism of a bar magnet is due toA. the earthB. cosmic raysC. the spin motion of electronsD. pressure of big magnet inside the earth |
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Answer» Correct Answer - C The magnetism of the magnet is due to the spin motion of electrons. Each electron in an atom is revolving in an orbit around the nucleus . The revolving electron is equivalent to a tiny loop of current . Therefore , it possesses some orbital magnetic dipole moment M = current ` xx ` area of the loop . In addition to the orbital motion , every electron is assumed to have a spin motion around its axis . Therefore , another dipole magnetic moment called spin magnet `M_s` is also associated with electron . The vector sum of `M_l` and `M_s` provides the net magnetic dipole moment M to the atom . `M_s` is much greater than `M_l` , hence magnetism of magnet is due to spin motion of electrons . |
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