[填空题]
(a) What is the electric po4 3)yhslnb) entential a disn.dvrrt4s-k q len0+-tance of $ 2.5\times10^{-15 }\,m$ away from a proton? $ \times10^{ 5}\,V$
(b) What is the electric potential energy of a system that consists of two protons $2.5 \times10^{-15 }\,m$ apart — as might occur inside a typical nucleus? $ \times10^{ -14}\,J$
