The study of charges in motion and their interaction with magnetic fields is known as?
(A) electrostatics
(B) electrodynamics
(C) electromotive
(D) electrons
(E) none of the above
2. Any material with an unequal number of
electrons and or protons could generally be
termed as ?

The study of charges in motion and their  interaction with magnetic fields is known as electromagnetism.

Any material with an unequal number of  electrons and or protons could generally be  termed as ion.

Explanation:

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a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid