What is the difference between electromagnetic radiation and an electromagnetic field?

Answer 1

This is a very good question indeed...albeit...quite difficult! I'll try....

Electromagnetic field is the disturbance of space around a charged particle moving into it.

Imagine a charged particle (an electron, for example) travelling through space with a certain velocity (figure (a) below). Around it the space is perturbed because of its presence; you can see this if you put a second charge in it; the new charge will "feel" the first one (the field produced by it).

Now let us go back to our initial charge; try to accelerate it (figure (b) to (e)).
This acceleration will produce a ripple into that initial field, exactly as a wave in a pond, that will propagate through space and that we call electromagnetic radiation.

The interesting thing is that em radiation will propagate because of the presence of the em field so they are both closely connected!!!

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Answer 2

Hunter Arthur

Electromagnetic radiation refers to the propagation of energy through space in the form of electromagnetic waves, such as light, radio waves, microwaves, and X-rays. An electromagnetic field, on the other hand, is a physical field produced by electrically charged objects, which exerts a force on charged particles within the field.

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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.