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What is a magnetic field composed of?

Answer 1

Photons.

Since virtual photons carry the electromagnetic field in quantum field theory, we could say that photons make up the magnetic field.

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Answer 2

Parker Albertson

The lines of force produced by moving electric charges, like electrons, make up a magnetic field. These lines of force loop around the magnetic material or the conductor that is carrying current, forming an area where magnetic forces act on other moving charges.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.