c sharp how to assign a rigidbody

                
                        GameObject myGameObject = new GameObject("Test Object"); // Make a new GO.
Rigidbody gameObjectsRigidBody = myGameObject.AddComponent<Rigidbody>(); // Add the rigidbody.
gameObjectsRigidBody.mass = 5; // Set the GO's mass to 5 via the Rigidbody.
                    
                

how to add reference to rigidbody 2d

                        
                                public Rigidbody2D rb;
                            
                        

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