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MAGNETIC PROPERTIES OF MATTER

MAGNETIC PROPERTIES OF MATTER. SLIDES BY ZIL E HUMA. OBJECTIVES. GAUSS’S LAW FOR MAGNETISM. GAUSS’S LAW FOR MAGNETISM. ELECTRIC DIPOLE :.

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MAGNETIC PROPERTIES OF MATTER

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  1. MAGNETIC PROPERTIES OF MATTER SLIDES BY ZIL E HUMA

  2. OBJECTIVES • GAUSS’S LAW FOR MAGNETISM

  3. GAUSS’S LAW FOR MAGNETISM ELECTRIC DIPOLE : The figure shows the electric field associated with an insulating rod having equal quantities of positive and negative charge placed on opposite ends. This is an example of an electric dipole. + -

  4. MAGNETIC DIPOLES The figure shows the analogous case of the magnetic dipole, such as thefamiliar bar magnet,with a north pole at one end and south pole at the other end. At this level the both cases look quite similar. N S

  5. DIFFERENCE BETWEEN ELECTRIC AND MAGNETIC DIPOLES Let us cut the objects in half and separate the two pieces. The two cases of electric and magnetic are no longer similar. In the electric case, we have two objects that, if separated by a sufficiently large distance, could be regarded as point charges of opposite polarities,each producing a field characteristic of point charge.

  6. In the magnetic case, we obtain not isolated north and south poles but instead a pair of magnets, each with its own north and south poles. This appears to be an important difference between electric and magnetic dipoles. An electric dipole can be separated into its constituent single charges but a magnetic dipole cannot.

  7. N + S N - S

  8. If the surface cuts through the dipole, so that it encloses a net charge q, the flux of the electric field is given by Gauss’s Law E = E.dA =q/o

  9. The magnetic form of the Gauss’s Law is B = B.dA = 0 DEF: The net flux of the magnetic field through any closed surface is zero

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