Rotational Force

Im making a tornado and in this script im using forces to pull objects into my tornado at an increased rate depending on distance. now I want to add rotational force. So what i want it to do is as objects get sucked into the tornado they will also start to rotate around the tornado the closer they get. I was wondering how i could acomplish this using addforce or something like that.

 const float G = 667.4f;

 public float TornadoPower;
 public float TornadoRotation;
 public float maxDistance;
 public float MinDistance = 100;
 public float RepelDistance = 200;

 public Rigidbody rb;

 void FixedUpdate()
 {
     GameOBJ[] gameObjects = FindObjectsOfType<GameOBJ>();
     foreach (GameOBJ obj in gameObjects)
     {
         if (obj != this)
         {
             Attract(obj);
         }
     }
 }

 void Attract(GameOBJ objToAttract)
 {
     Rigidbody rbToAttract = objToAttract.GetComponent<Rigidbody>();
     GameOBJ Attractforce = objToAttract.GetComponent<GameOBJ>();

     Vector3 direction = rb.position - rbToAttract.position;
     float distance = direction.magnitude;
     float rotation = (TornadoRotation * Time.deltaTime) / Mathf.Pow(distance, 2);
     if (distance <= maxDistance)
     {
         if (distance <= MinDistance)
         {
             return;
         }

         if (distance <= RepelDistance)
         {

             float forceMag = G * (TornadoPower * rbToAttract.mass * Attractforce.weight * .25f) / Mathf.Pow(distance, 2);

             Vector3 Force = direction.normalized * forceMag;

             rbToAttract.AddForce(-Force);
             return;
         }

         float forceMagnitude = G * (TornadoPower * rbToAttract.mass * Attractforce.weight) / Mathf.Pow(distance, 2);
         Vector3 force = direction.normalized * forceMagnitude;

         rbToAttract.AddForce(force);
     }
 }