Which is an example of the electromagnetic force?

a) a compass needle points north toward earth’s magnetic pole.
b) an iron nail rolls off a table and falls to the ground
c) the moon pulls on the water on earth’s oceans, causing tides
d) protons that make up a nitrogen atom stay together in the nucleus

A compass needle points north towards earths magnetic pole.

The correct answer is "A compass needle points north towards Earth’s magnetic pole".

Explanation:

Electromagnetic force: it is the combination of all magnetic and electrical forces.

Magnetic fields are the surrounding around the magnet in which the magnetic force can be experienced. A compass needle is an instrument which shows the deflection when there is a magnetic field. It is used to show the direction. Compass needle has south pole and north pole like magnet. These poles are repelled and attracted by the poles of the other magnet.

In the given examples, "compass needle points north toward Earth’s magnetic pole" is an example of the electromagnetic force.

Therefore, the correct option is (A).

real, smaller and upside-down.   so the answer should be b.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.