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diff --git a/‎electronics/electric_conductivity.py‎
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diff --git a/‎physics/sheer_stress.py‎
Lines changed: 51 additions & 0 deletions b/‎physics/sheer_stress.py‎
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+from __future__ import annotations
+
+ELECTRON_CHARGE = 1.6021e-19  # units = C
+
+
+def electric_conductivity(
+    conductivity: float,
+    electron_conc: float,
+    mobility: float,
+) -> tuple[str, float]:
+    """
+    This function can calculate any one of the three -
+    1. Conductivity
+    2. Electron Concentration
+    3. Electron Mobility
+    This is calculated from the other two provided values
+    Examples -
+    >>> electric_conductivity(conductivity=25, electron_conc=100, mobility=0)
+    ('mobility', 1.5604519068722301e+18)
+    >>> electric_conductivity(conductivity=0, electron_conc=1600, mobility=200)
+    ('conductivity', 5.12672e-14)
+    >>> electric_conductivity(conductivity=1000, electron_conc=0, mobility=1200)
+    ('electron_conc', 5.201506356240767e+18)
+    """
+    if (conductivity, electron_conc, mobility).count(0) != 1:
+        raise ValueError("You cannot supply more or less than 2 values")
+    elif conductivity < 0:
+        raise ValueError("Conductivity cannot be negative")
+    elif electron_conc < 0:
+        raise ValueError("Electron concentration cannot be negative")
+    elif mobility < 0:
+        raise ValueError("mobility cannot be negative")
+    elif conductivity == 0:
+        return (
+            "conductivity",
+            mobility * electron_conc * ELECTRON_CHARGE,
+        )
+    elif electron_conc == 0:
+        return (
+            "electron_conc",
+            conductivity / (mobility * ELECTRON_CHARGE),
+        )
+    else:
+        return (
+            "mobility",
+            conductivity / (electron_conc * ELECTRON_CHARGE),
+        )
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()
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+from __future__ import annotations
+
+
+def sheer_stress(
+    stress: float,
+    tangential_force: float,
+    area: float,
+) -> tuple[str, float]:
+    """
+    This function can calculate any one of the three -
+    1. Sheer Stress
+    2. Tangential Force
+    3. Cross-sectional Area
+    This is calculated from the other two provided values
+    Examples -
+    >>> sheer_stress(stress=25, tangential_force=100, area=0)
+    ('area', 4.0)
+    >>> sheer_stress(stress=0, tangential_force=1600, area=200)
+    ('stress', 8.0)
+    >>> sheer_stress(stress=1000, tangential_force=0, area=1200)
+    ('tangential_force', 1200000)
+    """
+    if (stress, tangential_force, area).count(0) != 1:
+        raise ValueError("You cannot supply more or less than 2 values")
+    elif stress < 0:
+        raise ValueError("Stress cannot be negative")
+    elif tangential_force < 0:
+        raise ValueError("Tangential Force cannot be negative")
+    elif area < 0:
+        raise ValueError("Area cannot be negative")
+    elif stress == 0:
+        return (
+            "stress",
+            tangential_force / area,
+        )
+    elif tangential_force == 0:
+        return (
+            "tangential_force",
+            stress * area,
+        )
+    else:
+        return (
+            "area",
+            tangential_force / stress,
+        )
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()