Question

Lab 20: Electric Field and Potential

Pre Lab Questions (Part 2)

6. How can you tell from an electric field map whether an electric field is strong or weak?

7. What would the electric field lines look like if the electric field was constant?

8. Can there be a point in space where there is an electric potential but not electric field? Can there be a point in space where there is an electric field but no electric potential? Explain your answer.

9. Use Figure 5 to answer the following questions:

a.) Are charges P and Q negative or positive? How do you know?

b.) Which particle has the highest magnitude of charge? How do you know?

Figure 5: Charged particles P and Q.

Answer 1

6) electric field is directly proportional to the number of field lines at the loction.

strong means field lines number is more.....weak means field lines number is less ..at the specified location

7) electic field is constant ..then all the field lines are parallel, so that the field is uniform

8) consider two positive charges of same magnitude separated some distance d. at the midpoint of along the line joining the charges electric fields cancel each other so that it is zero but not electric potential.

if the charges are of opposite sign ..electric potential is zero at the same location but not electric field