Which of the following descriptions of gravitational force is NOT true? A. It depends on the mass of objects.
B. It is a repulsive force.
C. It depends on the distance between objects.
D. It exists between all objects.

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=