Consider a fixed, positive point charge that is immersed in an infinite (in space) plasma. show that the net charge ofthe plasma over all-pace after forming a det eshield exactly cancels the value of the test charge. assume the ions are fixed, and that eφ kr.

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.