Show that, in a li. h. nonconducting region rather 'where 0 and j, 0, the fields e and b can be found completely from a vector potential, that is, ф-const. (zero is usually chosen). what two first. equations determine a? etiza- time, m oten- 22-7 consider a region where p,-0, j, -0, =0, while p is a given function of posi- the tion and time. show that (22-4) and (22-5) nd can be satisfied and the electromagnetic field ob- such that a l from a single vector

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.