A small metallic uncharged object is suspended between two vertical metal plates having equal and opposite charges, as shown. Due to the charges on plates an uniform electric field appears between the plates. Now the ball is touched to one of the plates and released. For this arrangement mark the correct statements. 

 

Let us consider that ball is first touched to positive plate, as a result it acquires positive charge and due to electric field from positive to negative plate it accelerates and comes in contact with negative plate. There it releases positive charge and acquires negative charge, thus again accelerating from negative to positive plate and this process repeats. In this way the positive charge of left plate is transferred to right plate and negative charge of right plate is transferred to left plate thus reducing the charge of both the plates to be zero.