7. When a compass needle is placed above a horizontal conductor, the needle points along the conductor. (2) i) What happens when the current starts to flow to the left? ii) To the right? 8. What is the motor principle and the right-hand rule for finding the direction of the force on a conductor in a magnetic field? (3) 9. A simple DC motor with two commutator segments is turned off and the armature comes to rest with the brushes touching the insulation between the segments. What will happen if the motor is turned on again? Why? (2)