Explanation:
The compass needle moved when the wire was connected to the battery. The important point here is that the needle is affected by the wire only when both ends of the wire are connected to the battery because only at this time is current flowing through the circuit.
The total is 21. If you use a calculator or count with your fingers it can help make the answer easier so in the end you will get 21 as your total.
D is the answer the force excerted on the ball is greater than gravity
The tendency for two masses alone in the universe to drift together is a result of gravitational pull.