Question 1 (1 point) Which technological device makes an energy conversion in the same way that a human ear makes an energy conversion? a light bulb a loudspeaker a headphone a microphone Question 2 (1 point) Which statement is a reason why a generator can produce electricity? An electric field can apply a force to a charged object A magnetic field can induce a current in a conductor moving within the field A magnetic field can exert a force on a metal object An electric field can make a current in a conductor moving within the field. Question 7 (2 points) Refer to the following diagram. After testing this student-built motor, the student saw the armature consistently turning in one direction. Describe two changes in the motor's design that would cause the armature to turn in the opposite direction (1 mark each). Question 8 (2 points) The output from a current generator is described by the following illustration. N S input of mechanical energy to turn axle t a. Explain why the voltage goes to zero during part of each cycle. (1 mark) b. Explain why the voltage magnitude peaks during part of each cycle. (1 mark)