diff --git a/crates/applications/multi_core_inverter/src/main.rs b/crates/applications/multi_core_inverter/src/main.rs
index e7e3ab7..0880181 100644
--- a/crates/applications/multi_core_inverter/src/main.rs
+++ b/crates/applications/multi_core_inverter/src/main.rs
@@ -385,7 +385,7 @@ fn main() {
     // let stim = DynStimuli::from_vec(stim.map(MapIntoBoxStimulus).into_vec());
     let mut driver = driver.with_stimulus(stim);
 
-    let prefix = "out/applications/multi_core_inverter/19-4ns-1e7A/";
+    let prefix = "out/applications/multi_core_inverter/20-4ns-1e7A/";
     let _ = std::fs::create_dir_all(&prefix);
     driver.add_state_file(&*format!("{}state.bc", prefix), 6400);
     driver.add_serializer_renderer(&*format!("{}frame-", prefix), 6400, None);
diff --git a/crates/coremem/src/stim.rs b/crates/coremem/src/stim.rs
index ffc3574..3aaff8c 100644
--- a/crates/coremem/src/stim.rs
+++ b/crates/coremem/src/stim.rs
@@ -266,7 +266,7 @@ impl<R: Region + HasCrossSection, T: TimeVarying1 + Sync> AbstractStimulus for C
     fn at(&self, t_sec: f32, pos: Meters) -> Fields {
         if self.region.contains(pos) {
             let FieldMags { e, h } = self.stim.at(t_sec);
-            let rotational = self.region.cross_section_normal(pos).norm();
+            let rotational = self.region.cross_section_normal(pos);
             let impulse_e = rotational.with_mag(e.cast()).unwrap_or_default();
             let impulse_h = rotational.with_mag(h.cast()).unwrap_or_default();
             Fields {