FIX: normalization logic in compute_total_normalized_e(...)

src/field.c

@@ -26,6 +26,7 @@ bool compute_total_normalized_e(charge_t *charges, int num_charges, vec2 p, doub
 		if (!compute_e(charges[i], p, eps, &ei)) return false;
 		*e = vec2_add(acc, ei);
 	}
+	*e = vec2_normalize(*e);
 	return true;
 }