A 14-gram ovarian tumor is treated using a sodium phosphate solution in which the phosphorus atoms are the radioactive Phosphorus-32 isotope with a half-life
of 14. 3 days and which decays via beta emission (RBE=1) with an energy of 1.71

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=