Two students are experimentinh with magnets. When they first try to put the magnets together, the magnets repel each other. When one student flips over her magnet, the magnets suddenly snap together. Which fundamental force are the students observing? A. electromagnetic
B. gravitational
C. strong nuclear
D. weak nuclear

Its A

Explanation:

Its A because Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel other objects.

d) physical means can be used to separate the components of air.

e/c, where e is its total energy