1.How can you easily increase the magnetic field strength inside a current-carrying coil?

2.What is a magnetic domain? What is the difference between an ordinary iron nail and a permanent magnet? How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

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  1. 1. Increase the current
    2. In a permanent magnet, the orbital currents of the electrons inside atoms are preferentially aligned in a certain direction.
    A magnetic domain is region in which the magnetic fields of atoms are aligned.

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