Правка разделов «Statement», «Answer»

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@@ -1,6 +1,8 @@
### Statement
−$6.5.13.$ [Insert the problem statement]
+$6.5.13.$ What work should be done to insert one system of differently charged parallel plates into another one
+ as shown in the figure? The surface charge density on the plates ±σ, the area of each plate S, and the
+ distance between the plates h are much smaller than the linear dimensions of the plates.
### Solution
@@ -10,4 +12,3 @@Solution
#### Answer
−[Insert a concise answer or boxed result]