Unit 9 Review

While switching electrical current from a battery on and off, Hans Christian Orsted made an interesting observation. He noticed that every time the electrical current was flowing from the battery, the needle on his compass would be deflected. Which fundamental force was responsible for this observation?

• Electromagnetic force

• Weak force

• Strong force

• Gravitational force

Which of the following is an example of the electromagnetic force?

• The Earth rotating around the Sun

• Protons and neutrons being bound to a nucleus

• The radioactive decay of subatomic particles

• A current carrying wire

Charles de Coulomb measured attractive and repulsive forces caused by charged objects. Which statement is true about the electromagnetic force?

• Only the charge of one object that is interacting with another charged object affects the electromagnetic force between the two objects.

• The distance between two charged objects has no effect on the electromagnetic force between the two objects.

• The charge between two charged objects has no effect on the electromagnetic force between the two objects.

• The charge and distance between two charged objects both influence the electromagnetic force between the two objects.

A transformer is a device used to increase or decrease the voltage through induction. Which fundamental force is responsible for this induction?

• Electromagnetic force

• Weak force

• Strong force

• Gravitational force

When the distance between two charges is doubled, the magnitude of the electrostatic force between them ―

• also doubles

• remains the same

• becomes half of what it was

• becomes one quarter of what it was

The graphic illustrates the path of a positively charged particle as it is fired between two plates of unknown charge.

• Plate A - Negative

  Plate B - Negative

• Plate A - Negative

  Plate B - Positive

• Plate A - Positive

  Plate B - Negative

• Plate A - Positive

  Plate B - Positive

Within an existing electric field, Point P has a greater number of electric field lines moving near it than Point T. Which of the following is true regarding the electric field?

• Point T is farther away from the charge used to generate the field than Point P.

• Identical charges placed at Point P and Point T will result in similar forces.

• A charge placed at Point P must have a greater magnitude than a charge placed at Point T.

• Charges placed at Point P and Point T must have different polarity.

In the graphic, a positive test charge is placed at Point P in the electric field shown. Which of the following is the best description of the net force on the charge once it is

released?

• Zero

• 
• 
• 

A long, straight wire carries an electrical current. Which of the following is the best description regarding the magnetic field created by the current?

• The magnetic field is weak, but parallel to the wire in the direction of the current.

• The magnetic field circles the wire forming a loop.

• The magnetic field is in straight lines opposite of the direction of the current.

• A straight wire does not create magnetic fields.

In which of the following situations will a charged particle experience a force from interacting with magnetic fields?

• A north pole of a magnet near a charged particle at rest

• A charged particle moving parallel to magnetic field lines

• A charged particle moving perpendicular to magnetic field lines

• All of the above