Which of the following are similarities between nuclear reactors and nuclear
bombs?
check all that apply !
a- both have critical mass
b- both produce exactly one additional fission for each fission
c- both are runaway fission reactions
d- both use chain reactions

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=