A thin diamagnetic rod is placed vertically between the poles of an electromagnet.
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from
(1) the current source
(2) the magnetic field
(3) the lattice structure of the material of the rod
(4) the induced electric field due to the changing magnetic field
3 Answers
Answer is (1) the current source
When current source is switched on, magnetic field sets up between poles on electromagnet.
Diamagnetic material, due to its tendency to move from stronger to weaker field, is thus repelled out.
In electromagnet magnetic energy is obtained by the current source which is balanced gravitational potential energy.