Electromagnetic force occurs when
a. atoms in the field lose an electron.
b. an electromagnetic field interacts with charged particles.
c. atoms gain an electron.
d. electromagnetic fields gain proto

B.An electromagnetic field interacts with charged particles.

Explanation:

As we know that electromagnetic field is the combination of electric field and magnetic field both.

If the electric field or magnetic will interact with charge particle then due to interaction of charge particles with the field there is force on the charge particle which is given as

for electric field

for magnetic field

so in both cases the charge particle will have interaction with magnetic field or electric field

so correct answer would be

B.An electromagnetic field interacts with charged particles.

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