Mazur’s E-Field questions

QUESTION 1: Consider the four field patterns shown below. Assuming there are no charges within the regions shown, which of the patterns represent(s) a possible electrostatic field?

1. (a) only 2. (b) only

3. (b) and (d) 4.(a)and(c)

5. (b) and (c) 6. other combination

7. none of the above can be an electrostatic field

PC 0209-Q1

QUESTION 2: A dipole (electrically neutral) is placed in an external field. For which situation(s) shown below is the net force on the dipole zero?

1. (a) only 2. (c) only

3. (b) and (d) 4. (a) and (c)

5. (c) and (d) 6. other combination

7. none