On page 433 of book II in connection with worked problem 24.1:
The field lines in figure WG24.3 are incorrect. They violate the Maxwell equations. Recall that the spacing between field lines is an indication of field strength (or rather the inverse thereof). The field lines near the midplane are much too close together. This indicates a strong field. This locally strong field means there is a tremendous amount of curl in the field : dEy/dx is huge and is not cancelled by any other contributions.
Important connection:
There has been some discussion of the fact that reasoning is like running a maze; it is not like running laps on a well-lit track. Backtracking is often necessary. That means giving up on a minor sub-goal in order to further the main overall goals.
Do not remove the incorrect diagram. Explain that it is necessary to draw the diagram before realizing what the problem is.
Supplement it with a better diagram. Explain that having seen what can go wrong, it is possible to redraw the field pattern with a slight shift. This does not change the meaning anywhere else, but it produces a much better result near the midplane.
Emphasize the importance of checking the work.
Emphasize the role of backtracking when running a maze in particular, and when reasoning in general.
On page 433 of book II in connection with worked problem 24.1:
The field lines in figure WG24.3 are incorrect. They violate the Maxwell equations. Recall that the spacing between field lines is an indication of field strength (or rather the inverse thereof). The field lines near the midplane are much too close together. This indicates a strong field. This locally strong field means there is a tremendous amount of curl in the field : dEy/dx is huge and is not cancelled by any other contributions.
Important connection:
There has been some discussion of the fact that reasoning is like running a maze; it is not like running laps on a well-lit track. Backtracking is often necessary. That means giving up on a minor sub-goal in order to further the main overall goals.
This exercise can be used to make that point. See also https://www.av8n.com/physics/research-maze.htm and https://www.av8n.com/physics/glorpy-maze.html
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