Which statement correctly describes magnetic field lines?
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A. They form loops by joining north pole to south pole.
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B. They show the direction a south pole will point.
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C. They form loops by joining positive charge to negative charge.
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D. They are parallel with one another.

Blank liquids and gases exert a buoyant force on objects placed in them

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.