Problem 2.20 One of these is an impossible electrostatic field. Which one? (a) E=k[xy£+2yzý+3xzZ]; (b) E= k[y² + (2xy + z²)ŷ + 2yz 2]. Here k is a constant with the appropriate units. For the possible one, find the poten- tial, using the origin as your reference point. Check your answer by computing VV. [Hint: You must select a specific path to integrate along. It doesn't matter what path you choose, since the answer is path-independent, but you simply cannot integrate unless you have a definite path in mind.]

Problem 2.20 One of these is an impossible electrostatic field. Which one? (a) E=k[xy£+2yzý+3xzZ]; (b) E= k[y² + (2xy + z²)ŷ + 2yz 2]. Here k is a constant with the appropriate units. For the possible one, find the poten- tial, using the origin as your reference point. Check your answer by computing VV. [Hint: You must select a specific path to integrate along. It doesn't matter what path you choose, since the answer is path-independent, but you simply cannot integrate unless you have a definite path in mind.]