Faraday's Law Quiz

In the diagram above, a conducting rod with length L moves horizontally on a set of conducting rails at a constant velocity v through a magnetic field B. What direction is the induced current in the circuit?

• Clockwise

• Counterclockwise

• Right

• Left

In the diagram above, a conducting rod with length L moves horizontally on a set of conducting rails at a constant velocity v through a magnetic field B. If the resistance of the rod is R, what is the magnitude of the induced current in the circuit?

• Bv/R

• v

• BLv/R

• 0

In the diagram above, a conducting rod with length L moves horizontally on a set of conducting rails at a constant velocity v through a magnetic field B. There is a friction between the rod and the track it is riding on. The coefficient of friction is μ. If the rod has mass m, what is the applied force?

• B^2L^2v/R + μmg

• B^2L^2v/R - μmg

• B^2Lv/R + μmg

• B^2Lv/R - μmg

At the South Pole, the Earth's magnetic field is directed upwards. If a plane is flying over the South Pole, which wing will have the higher potential? (which wing will be polarized positive)

• The left wing

• The right wing

• Both wings have the same potential

• It is impossible to answer this question

A loop of wire sits in an unchanging magnetic field. Which of the following is NOT a way to induce a current through the loop?

• Rotate the loop about its diameter

• Spin the loop about its center

• Stretch the loop

• Squeeze the loop

A square loop of wire carries current I1 above in a clockwise direction a straight wire that carries current I2 towards the left. In what direction is the net force on the loop?

• Up

• Down

• Right

• Left

How does the current flow through resistor R2 behave once switch S is closed?

• From point Y to X

• From point X to Y

• The current oscillates between X and Y

• There is no current through the resistor

A rod of length L lies on a set of conducting rails connected to a resistor R. The rod is pulled to the right at a constant velocity v through a magnetic field B. How much power is dissipated in the resistor as the rod is being pulled?

• 0

• B^2*L^2*v^2/R

• B/R

• B^2*L*v/R

Which of the following will generate a current in a conducting loop? Select two answers:

• A bar magnet moving towards the loop.

• A bar magnet remaining stationary within the loop.

• The loop rotating on an axis perpendicular to the bar magnet.

• A magnet and the loop moving to the right with the same velocity.

A metal bar is being pushed along two conducting rails that are connected by a stationary wire parallel to the moving bar. What is required to generate a constant current in the bar/rail/wire configuration? Select two answers:

• An external constant perpendicular magnetic field within the bar/rail/wire configuration.

• An external constant parallel magnetic field within the bar/rail/wire configuration.

• The bar needs to be pushed so that it moves with a constant velocity.

• The bar has to stay stationary.