PLEASE HELP ASAP a force of -7.7 x 10^3N exists between a positive charge of 5.6 x 10-^4C and a negative charge of -2.1 x 10^-4C. What distance separates the charges? ​

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.