At large distances, a bar magnet acts like the magnetic dipole created by a curr

Question

At large distances, a bar magnet acts like the magnetic dipole created by a current carrying loop. Imagine such a magnet is oriented as shown. The field strength at a point 10 cm from the magnet along the dipole axis is 5.0 ?T, where 10 cm >> the size of the magnet. The field strength is calculated in your book for a current carrying loop and the dipole moment of such a loop is discussed. Look up the discussion and answer the following:
a) What is the magnetic dipole moment of the bar? b) What is the on-axis field strength 15 cm from the magnet?

Explanation / Answer

A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.

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