What are magnetic field lines ?
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It is defined as the path along which the unit north Pole ( imaginary) tends to move in a magnetic field if free to do so.
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The magnetic field can be defined as:
“A region around/surrounded by a moving electric charge or a magnetic material within which the force of magnetism acts.”
How does Magnetic Field occur?
If you are wondering how Magnetic fields occur. Well, it occurs whenever a charge is in motion. That being said if you apply more charge in the motion the strength of a magnetic field usually increases. Besides, Magnetism and magnetic fields are part of the electromagnetic force which is indeed one of the four prime forces of nature.
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