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Taiyuan Ermo liberal arts mathematics answer
A, proton electric field force points to the curve side of trajectory, so proton electric field force points to negative charge, so the charge at point B must be negative charge, so A is correct;

B, the electric field force of protons has nothing to do with the speed direction, so it is impossible to judge whether protons move from M to N or from N to M, so B is wrong;

C, d, because ao > ob, φM is greater than φ n according to the distribution characteristics of electric field lines and equipotential surfaces with the same amount of different point charges;

The potential of positive charge is large at the position with high potential, so the potential of proton at point M is greater than that at point N; So, C is wrong and D is right;

Therefore: ad.