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A magnetic field would be produced by a beam of (3) protons.
Although you could easily make a case for any of these four options (the question is pretty ambiguous), there can be only one correct answer, which is the third option, in this case.

A magnetic field would be produced by a beam of protons. The Proton beam is responsible for magnetic field production.

What is a magnetic field?

It is the type of field where the magnetic force is obtained. With the help of a magnetic field. The magnetic force is obtained it is the field felt around a moving electric charge.

A magnetic field would be produced by a beam of protons. The Proton beam is responsible for magnetic field production.

Hence option 4 is correct.

To learn more about the magnetic field refer to the link;

https://brainly.com/question/19542022