The field lines around one end of a bar magnet are shown below.
a vertical box labeled with a question mark. curved lines with arrowheads point into the top of the box from the top and sides.
based on the diagram, what can you conclude about the pole of the magnet?
it is a south pole because the field lines spread out from this end.
it is a north pole because the field lines spread out from this end.
it is a south pole because the field lines enter the magnet at this end.
it is a north pole because the field lines enter the magnet at this end.

The correct option here would be the third one because it is true.

Explanation:

The diagram shows a bar magnet that has lines that are parallel to each other and are pointing towards one side of the rectangle.

The side of rectangle is South Pole because the arrows that are shown in the diagram are nothing but field lines and these lines tend to start from North Pole and the arrow shows moving inside that point hence that point it would be South Pole showing field lines ending at it.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

the answer is d.) potassium