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the first one:

How much work is required to bring three protons initially infinitely apart, to a configuration where each proton is 1.5x10^-13 m from the other two? (This is a typical separation for protons in a nucleus.)

second one

A point charge of mass 0.071 kg and charge +6.77x10^-6 C is suspended by a thread between the vertical parallel plates of a parallel-plate capacitor. (a) If the charge deflects to the right of vertical, which of the two plates is at the higher electric potential? (b) If the angle of deflection is 22 degrees, and the separation between the plates is 0.025 m, what is the potential difference between the plates?

I know that the answer to A is the plate on the left, but i dont know how to find part B.

Any help would be appreciated, thanks