III. Flux Ask a tutorial instructor for a block of wood with nails through it. The nails represent uniform electric field lines. (The block of wood does Po not represent anything but serves to hold the nails in place.) At right is a two-dimensional representation of the same electric field as viewed from the side. A. Compare the magnitude of the electric field at points P and Q. Explain your reasoning. Once again, consider the relative spacing between neighboring field lines. The nails represent the uniform electric field lines through the block. Point Q is on the field line, while point P lies between the field lines. The magnitude of the point P is weaker than that of point Q. The electric field is stronger at the point where the electric field lines are closer together. Suppose you were given another block of wood with nails representing a weaker uniform electric field than the one above. How would the two blocks differ? Explain. B. Obtain a wire loop. The loop represents the boundary of an imaginary flat surface of area A. (In order to allow the nails that represent the field to pass through the surface, you have only been given the boundary of the surface.) Draw a diagram to show the relative orientation of the loop and the electric field so that the number of field lines that pass through the surface of the loop is: .E. The diagram at right shows a two-dimensional top view of the electric field lines representing the electric field for a positively charged rod. You determined previously that the magnitude of the electric field at point A was larger than the field at point B. What feature of the electric field lines reflects this information about the magnitude of the field? In your explanation, consider the relative spacing between neighboring field lines. arrow that has length proportional to its magnitude line density