Question

what is magnetic field lines ?how is the direction of magnetic field at a point determined ?

Answer 1

# magnetic field lines are imaginary lines used for show magnetic field

# Magnetic filed lines are closed continues curves

# Magnetic field lines can not intersect each other

# the direction of Magnetic field is south to North




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Answer 2

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.