The rectangle pivots about the point of contact with the floor. The further the pole is away from the pivot point, the less force it needs to apply to achieve the same torque (the torque needed to keep the rectangle static). Thus Pole 2, the pole that is further away from the point of contact with the floor applies less force on the rectangle. This is essentially the Law of the Lever.
By Newton's 3rd Law, the rectangle applies less force on Pole 2 as well.
Therefore, the correct answer is 1.
1. Twice as strong
2. Half as strong
Adding a power source in parallel does not change the values already set for the circuit, as they match the existing power source. Adding a cell or battery in parallel is usually devised as a form of electrical backup to a circuit, and not as a means to change the voltage.
Therefore, the correct answer is 3.