Astudent wants to vary the force of repulsion between two magnets. which method could the student use?
a.
face opposite poles of the magnets toward one another, and vary their distance.
b.
face the same poles of the magnets toward one another, and vary their distance.
c.
face the same poles of the magnets toward one another, and vary their temperature.
d.
face opposite poles of the magnets toward one another, and vary their temperature.