Unit 5: Electricity and Magi SPH3U1 - Grade 11 Physics http://www.dpedsb.org/AMBRO 8. For the following diagram, the current-carrying wire will experience a force in which direction? a. right b. downward S C. upward left 9. A current-carrying conductor that cuts across external magnetic field lines experiences a force perpendic the magnetic field and the direction of the electric current. What is the name for this fact? a. the motor principle b. right-hand rule for solenoids C. magnetic resonance d. Ohm's law 10. A wire carrying conventional current to the right experiences an upward force from an external magnet what direction is the magnetic field pointing? a. downward b. out of the page c. in to the page d. upward 11. For the following DC motor, in what direction will the loop spin? a. The loop will spin counterclockwise. S b. The loop will not spin. c. The loop will spin clockwise. d. The loop will spin half way clockwise and then back counterclockwise. 12. Which of the following can improve the design of a single loop DC motor? a. increasing the current b. adding a soft-iron core c. increasing the number of loops d. all of the above 13. Which of the following improvements on the DC motor is not desirable because it will produce energy? a. adding a soft-iron core b . increasing the current c. increasing the strength of the magnetic field d . increasing the number of loops 14. The following diagram shows a multiple coil DC motor with a soft-iron core. For the coil in the given position and conventional current in the direction indicated, what magnetic pole is side A (right) of the coil and in what direction will the motor spin? a. adding a soft-iron core p. increasing the current c. increasing the strength of the magnetic field d. increasing the number of loops