Question 3 Part 2: These (challenge) questions are for practice. Credit is based on answering and explaining your thinking, with no penalty for any incorrect answers. However, to be eligible for full credit you must provide complete and thorough explanations. Imagine you are in physics lab, and your TA gives you a challenge question: A source charge +Q. is placed on a grid as shown. The electric potential at point P, marked on the diagram, is measured to be Vp = 2 Volts. -Qo Then three other sources charges, each +Q. like the original, are added as shown, so that there are now four source charges arranged at the corners of a square, with point P at the middle of the square. Qo Qo Qo -Qo The electric potential at point P is measured again. The value will now be: O 2 volts O 0 volts O 8 volts O none of these is correctQuestion 4 Explain your reasoning for your previous response. Edit View Insert Format Tools Table 12pt " Paragraph " B I U A v Q V T V Q V VQV BY Q 0 8 VEVEV D BV V Q 1 0 words >Question 5 You overhear a student in another lab group, Devon, discussing this question with the TA: Devon: "I don't think electric potential has any direction associated with it." TA: "That's correct, electric potential is a scalar quantity." The ideas discussed by Devon and the TA may (or may not) lead you to reconsider your response. Would you answer or explain the question differently now, compared to before? O Yes, definitely. My answer and explanation have both changed O Yes, somewhat. My answer has not changed, but I would now change or add to my explanation somewhat. O Not really. My answer and explanation are the same as before.Question 6 Here describe any ways in which your answer or explanation for the four-charges-on-a-square question have changed. Edit View Insert Format Tools Table 12pt Paragraph : | B I Y Av 2. EV EVEYQuestion 7 A thin ring of radius R is centered on the z-axis at z = 0. The ring has positive charge + Q spread uniformly around it. R +Q +Z Z=0 Is the electric potential at the origin, z = 0, positive, negative or zero? Explain