Q1: How does electromotive force aid or oppose this motor?

The Electromotive Force (EMF) actually hinders the operation of this motor, since--without the help of the bar magnet attached to the battery--the coil would spin to a point and stop as it aligned with the predominant magnetic field. The magnet aids to "nudge" the coil and cause it to rotate slightly past the point of being aligned with the magnetic field, and thus rotate once again.

Q2: What variable causes the motor to want to spin one way and not the other?

The direction of current flow (I) determines the direction of spin of the motor, since a moving current in the coil induces a magnetic field.

Q3: How does the magnet affect the rotation of the motor?

The magnet aids to "nudge" the coil and cause it to rotate slightly past the point of being aligned with the magnetic field, and thus rotate once again.

Q4: Try using two magnets. How does it change the rotation? Why?

Adding another magnet near the coil will cause it to increase its rotation or slow it considerably depending on whether or not the magnet is oriented so as to attract or repel the spinning coil. An opposing magnetic field will cause the coil to rotate faster; an attracting magnetic field will cause the coil to slow.

Q5: Sketch and describe the magnetic fields in this motor, including how they change direction.

Arrows represent potential magnetic field directions. Rotating the coil and following the magnetic field demonstrates how the magnet below "nudges" the coil to keep it turning.

Questions 6 and 7 are subjective.

Q6: Discuss possible improvements for this motor.

Q7: Can you think of any practical applications for this motor?