AP Physics 2 Review

How does a magnetic field affect a moving electric charge?

• It doesn't

• It exerts a force parallel to the velocity of the charge and parallel to the direction of the field

• It exerts a force perpendicular to the velocity of the charge and parallel to the direction of the field

• It exerts a force perpendicular to the velocity and perpendicular to the direction of the field

Answer explanation

Remember your right hand rule! The velocity the charge, the direction of the field, and the force the charge experiences are all perpendicular to each other.

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NGSS.HS-PS2-5

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Which image represents a magnetic field out of the page, and a charged particle moving to the left?

• Left

• Middle

• Right

Answer explanation

Right-hand rule!

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What does a magnetic field around a current-carrying straight wire look like?

• Field lines come out of the wire in every direction

• Field lines circle around the wire

• Field lines bend from one side of the wire to the other

• The wire would have no field lines because it doesn't have a magnetic field

Answer explanation

Think about the right-hand rule: if your thumb points in the direction of current, your fingers will curl around in the direction of the field lines

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NGSS.HS-PS2-5

What does a magnetic field around a current-carrying solenoid look like?

• Field lines come out of the solenoid in every direction

• Field lines circle around the solenoid

• Field lines go straight through the loops then bend from one end of the solenoid to the other

• The solenoid would have no field lines because it doesn't have a magnetic field

Answer explanation

Inside the solenoid, the field lines are straight, but outside the solenoid, it looks similar to the field lines of a bar magnet

Tags

NGSS.HS-PS2-5

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Which law states that the total energy in a closed system remains constant?

• Law of Conservation of Momentum

• Law of Conservation of Energy

• Newton's First Law of Motion

• Hooke's Law

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If I put a magnet that can freely move into a magnetic field, what will happen?

• Nothing

• It will turn to be perpendicular to the field lines

• It will turn to be parallel to the field lines, with the magnet's north pole pointed towards the field's south pole

• It will turn to be parallel to the field lines, with the magnet's north pole pointed towards the field's north pole

Answer explanation

Remember, north is attracted to south and vice versa.

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The two wires shown are carrying some current I. What will happen to the wires?

• They will attract

• They will repel

• They will rotate

• Nothing will happen

Answer explanation

When the current is in the same direction, they attract. When the current is in opposite directions, they repel. (Remember the mnemonic I taught you!)

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NGSS.HS-PS2-5

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Which of the following will affect the torque on a loop?

• The area of the loop

• The current in the loop

• The strength of the magnetic field

• The angle between the dipole and the magnetic field

Which of the following are situations where a magnet can induce a current in a coil of wire?

• If you move a magnet in and out of the coil

• If you move the coil in and out of a magnet

• If you put multiple magnets near the coil

• If you open or close the circuit with the coil

Answer explanation

Induced currents arise when there is a changing magnetic field

Tags

NGSS.HS-PS2-5

What does the motional emf of a conductor depend on?

• strength of magnetic field

• speed of conductor

• length of conductior

• resistance of the wire

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