Fix opf -> of typo in Serway and Jewett v8's problem 23.43.

diff --git a/latex/problems/Serway_and_Jewett_8/problem23.43.tex b/latex/problems/Serway_and_Jewett_8/problem23.43.tex
index b0f259986431cdd74ed0793084e0cf443f725cbb..db3343d61dd33df106e9f1759a52213080178ba3 100644 (file)
--- a/latex/problems/Serway_and_Jewett_8/problem23.43.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem23.43.tex
@@ -1,6 +1,6 @@
 \begin{problem*}{23.43}
 An electron and a proton are each placed at rest in a uniform electric
-field opf magnitude $520\U{N/C}$.  Calculate the speed of each
+field of magnitude $520\U{N/C}$.  Calculate the speed of each
 particle $48.0\U{ns}$ after being released.
 \end{problem*}