Physics Quiz

What are the two main theories on which motors work?

• Electromagnetic theory and gravitational theory

• Electromagnetic theory and the theory of electromagnetic induction

• Quantum theory and the theory of relativity

• Kinetic theory and potential energy theory

According to the text, what happens when a current is present in a conductor?

• A magnetic field is set up around the conductor in a random direction

• A magnetic field is set up around the conductor, always in a counterclockwise direction

• A magnetic field is set up around the conductor, always in a clockwise direction

• No magnetic field is set up around the conductor

What determines the direction and strength of the induced current when a conductor passes through a magnetic field at right angles?

• The color and material of the conductor

• The temperature of the conductor

• The direction of movement of the conductor and the speed at which the conductor moves

• The electrical resistance of the conductor

What basic principle do nearly all motors work on regarding a current-carrying conductor in a magnetic field?

• The conductor experiences a decrease in temperature.

• The conductor experiences a force.

• The conductor becomes insulated.

• The conductor stops conducting electricity.

What happens to the main magnetic field when a current-carrying conductor is placed between two magnetic poles?

• The field remains unchanged.

• The field becomes distorted.

• The field becomes stronger uniformly.

• The field reverses its direction.

According to the diagrams, what symbolizes the current flowing away from you?

• A clockwise corkscrew movement.

• A counterclockwise corkscrew movement.

• A static corkscrew position.

• No corkscrew movement.

What effect does reversing the current through the conductor or the direction of the magnetic field have on the force acting on the conductor?

• The force stops acting on the conductor.

• The force continues in the same direction.

• The force on the conductor tends to move it in the reverse direction.

• The force on the conductor doubles in intensity.

According to Fleming's left hand rule, what does the thumb represent when determining the direction of motion in a current-carrying conductor within a magnetic field?

• Direction of the magnetic field

• Direction of the electric current

• Direction in which the conductor tends to move

• Direction of the applied force

What does the first finger represent in Fleming's left hand rule?

• Direction of the magnetic field

• Direction of the electric current

• Direction in which the conductor tends to move

• Direction of the applied force

What does the second finger indicate in Fleming's left hand rule?

• Direction of the magnetic field

• Direction of the electric current

• Direction in which the conductor tends to move

• Direction of the applied force