Two protons are located next to each other in the nucleus of a Carbon atom. Which of the four fundamental forces are greatest between them?

a. The weak nuclear force between them

b. The strong nuclear force holding them together in the nucleus

c. The gravitational attraction between them

d. The repulsion of their charges

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)