Question

Write about Magnetic Dipole and Magnetic Field Lines

Answer 1

Answer:

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Magnetic Dipole

• Magnetic dipole means the two poles of a magnet Where the magnetic field is greater

Magnetic Field lines

• Magnetic field lines are Closed curves of a magnet where its strength lies.

Answer 2

A magnetic dipole is the limit of either a closed loop of electric current or a pair of poles as the size[clarification needed] of the source is reduced to zero while keeping the magnetic moment constant. It is a magnetic analogue of the electric dipole, but the analogy is not perfect. In particular, a magnetic monopole, the magnetic analogue of an electric charge, has never been observed. Moreover, one form of magnetic dipole moment is associated with a fundamental quantum property—the spin of elementary particles.

The magnetic field due to natural magnetic dipoles (upper left), magnetic monopoles (upper right), an electric current in a circular loop (lower left) or in a solenoid (lower right). All generate the same field profile when the arrangement is infinitesimally small.

The magnetic field around any magnetic source looks increasingly like the field of a magnetic dipole as the distance from the source increases.In classical physics, the magnetic field of a dipole is calculated as the limit of either a current loop or a pair of charges as the source shrinks to a point while keeping the magnetic moment m constant. For the current loop, this limit is most easily derived for the vector potential. Outside of the source region, this potential is (in SI units)

$a(r) = \frac{uo}{4\pi {r}^{2} } \frac{m \times r}{r} = \frac{uo}{4\pi} \frac{m \times r}{ {3}^{2} }$

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