4.1 point charges q, = 1 nc and q2 = 2 nc are at a distance apart. which of the following statements are incorrect? (a) the force on ql is repulsive. (b) the force on q2 is the same in magnitude as that on qx. (c) as the distance between them decreases, the force on ql increases linearly. (d) the force on q2 is along the line joining them. (e) a point charge q3 = — 3 nc located at the midpoint between q{ and q2 experiences no net force

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.