Two protons moving with same speed in same direction repel each other but what about two protons moving with different speed in the same direction?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.