The number of electrons in a copper penny is approximately 10*10^23. how large would the force be on an object if it carried this charge and were repelled by an equal charge one meter away?

i am using don't panic volume 2. how do you do this problem step by step?

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.