Rotate object around certain point using phyics

I want to rotate my object on world certain point using physics not using transform or rotate. I want implementation that work on 2d game. Similar to following code snippet :

     float copterSpeed = 4f;
     float rotationSide = 1f;
     float rotationSpeed = 180f;    
 
     void Update()
     {
          if (Input.GetMouseButton(0))
         {
             float rotation = rotationSpeed * rotationSide; //rotationSide > 0 for no rotation, 1 for counter-clockwise, -1 for clockwise.
             transform.Rotate(Vector3.forward * rotation * Time.deltaTime);
             transform.position += transform.right * copterSpeed * Time.deltaTime;
         }            
     }

Similar implementation I want for physics based. I found following code also but it rotate object around local point

     var velocity : int = 100;
     var sphere : GameObject;
     var slower : float;
     var angle : float;
     
     function FixedUpdate () {
     
     
         var targetDir = sphere.transform.position - transform.position;
         var forward = transform.forward;
         var localTarget = transform.InverseTransformPoint(sphere.transform.position);
         angle = Mathf.Atan2(localTarget.x, localTarget.z) * Mathf.Rad2Deg;
         //angle = Vector3.Angle(targetDir, forward);
 
     
         var eulerAngleVelocity : Vector3 = Vector3 (0, angle, 0);
         var deltaRotation : Quaternion = Quaternion.Euler(eulerAngleVelocity * Time.deltaTime );
         rigidbody.MoveRotation(rigidbody.rotation * deltaRotation);
     }

Please give some suggestion for this problem.