diff --git a/modules/m54437/index.cnxml b/modules/m54437/index.cnxml
index f4f3513..4c785d8 100644
--- a/modules/m54437/index.cnxml
+++ b/modules/m54437/index.cnxml
@@ -1035,7 +1035,7 @@ In the 19th century, the German physicist Georg Simon Ohm (1787–1854) found ex
 <problem id="fs-id1167061388144">
 <!--<para id="fs-id1167063490563"><link class="os-embed" url="#ost/api/ex/k12phys-ch19-ex020"/>
 </para>-->
-<para id="fs-id1164564775216">An accelerator accelerates He nuclei (change = 2<emphasis effect="italics">e</emphasis>) to a speed of <emphasis effect="italics">v</emphasis> = 2 × 10<sup>6</sup> m/s. What is the current if the linear density of He nuclei is <emphasis effect="italics">λ</emphasis> = 108 m<sup>–1</sup>?</para>
+<para id="fs-id1164564775216">An accelerator accelerates He nuclei (charge = 2<emphasis effect="italics">e</emphasis>) to a speed of <emphasis effect="italics">v</emphasis> = 2 × 10<sup>6</sup> m/s. What is the current if the linear density of He nuclei is <emphasis effect="italics">λ</emphasis> = 108 m<sup>–1</sup>?</para>
 <list id="fs-id1164566905199" list-type="enumerated" number-style="lower-alpha">
 <item><emphasis effect="italics">I</emphasis> = 9.6 × 10<sup>–5</sup> A</item>
 <item><emphasis effect="italics">I</emphasis> = 3.2 × 10<sup>–5</sup> A</item>