diff --git a/3.3.4-semiconductor-hall-effect/images/setup.png b/3.3.4-semiconductor-hall-effect/images/setup.png
new file mode 100644
index 0000000..2818dbb
Binary files /dev/null and b/3.3.4-semiconductor-hall-effect/images/setup.png differ
diff --git a/3.3.4-semiconductor-hall-effect/processing.ipynb b/3.3.4-semiconductor-hall-effect/processing.ipynb
index 046144c..f3f10b1 100644
--- a/3.3.4-semiconductor-hall-effect/processing.ipynb
+++ b/3.3.4-semiconductor-hall-effect/processing.ipynb
@@ -299,39 +299,51 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 202,
+   "execution_count": 204,
    "id": "8f61c6e8-356b-4a4c-b797-dd5e8d0331eb",
    "metadata": {},
+   "outputs": [],
+   "source": [
+    "a = 2.2e-3\n",
+    "L35 = 3e-3\n",
+    "l = 2.5e-3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 207,
+   "id": "1f153f00-d44c-41e5-8bab-ad09bd8e5896",
+   "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "31"
+       "274.0977615349475"
       ]
      },
-     "execution_count": 202,
+     "execution_count": 207,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "sigma = 31 # +- 3 (Ом * м)^-1\n",
+    "sigma = 1 * L35/(1.99 * a * l)\n",
     "sigma"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 203,
+   "execution_count": 208,
    "id": "cf5b7366-16f9-434f-969f-74b61fed23ca",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "133.8867586364592"
+       "1183.8084142394603"
       ]
      },
-     "execution_count": 203,
+     "execution_count": 208,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -340,6 +352,14 @@
     "b = sigma * R_h\n",
     "b*10000"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "7b445096-817d-428c-b76d-5fe0160b3bb0",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {