Magnetism Review

A group of students was discussing whether the concept of magnetic fields is just a theory or if magnetic forces can be shown to exist between objects that are not touching. Some of the students were convinced that these forces only exist in theory while the rest of the students decided to prove that these forces actually exist. How can the students prove that magnetic forces exist between objects that are not touching each other?

• Place two bar magnets on a table six inches apart with similar poles facing each other.

• Place two bar magnets on a table six inches apart with opposite poles facing each other.

• Use two magnets, one on the door and one on the door frame, to hold a cabinet door closed.

• Tape a bar magnet to the top of a toy car and use a second bar magnet to move the car without allowing it to touch the car.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Where does a magnet have the strongest magnetic field?

• at the poles

• in the middle

• only at the north pole

• only at the south pole

Tags

NGSS.MS-PS2-3

Allison is working on a science activity. She takes an iron rod and wraps insulated copper wire around it. She connects the ends of the copper wire to the battery. Allison switches on the circuit and brings some paper clips near the iron rod. The paper clips are attracted to the iron rod. Which of the following will cause the paper clips to fall off the iron rod?

• increase the current flow through the circuit

• switch on the circuit to start the current flow

• increase the copper wiring around the iron rod

• switch off the circuit to stop the electric current

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

If two objects, one with a negative charge and one with a positive charge, come into close contact with one another, what would you expect to see happen?

• They will repel.

• They will attract.

• They will divorce.

• They will unite.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

If two objects, both with negative charges, come into close contact with one another, what would you expect to see happen?

• They will repel.

• They will attract.

• They will divorce.

• They will unite.

Tags

NGSS.MS-PS2-3

A student makes an electromagnet but needs it to be stronger. Which of the choices below would accomplish this?

• Add more loops of wire to the coil.

• Remove loops of wire from the coil.

• Reduce the voltage of the battery.

• Increase the voltage of the battery.

Tags

NGSS.MS-ETS1-2

Which of these choices will create a magnetic field

• A spinning electron

• A current-carrying wire

• A coil of wire connected to a voltmeter

• A battery sitting on the desk.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Students collect data during a lab about the magnetic field that forms around a current-carrying wire. Look at the data table and choose the student below who has the best justification for the results.

• The distance from the wire does not affect the magnetic field strength detected.

• The closer you get to the wire, the stronger the magnetic field strength becomes.

• The closer you get to the wire, the weaker the magnetic field strength becomes.

Tags

NGSS.MS-PS2-3

Students collect data during a lab about the magnetic field that forms around a current-carrying wire. Look at the data table and choose the student below who has the best justification for the results.

• The current through the wire does not affect the magnetic field strength detected.

• The higher the current in the wire, the stronger the magnetic field strength becomes.

• The higher the current in the wire, the weaker the magnetic field strength becomes.

Tags

NGSS.MS-PS2-3

Which of the following best describes a situation in which magnetic induction is occurring?

• A permanent magnet sits beside a wire and current flows through the wire.

• An ammeter is attached to the wire and current flows through the wire.

• A coil of wire is moved inside a magnetic field from a permanent magnet creating current in the wire.

• A switch is closed on a simple circuit with a battery and a switch so current flows through the wire.

Tags

NGSS.HS-PS2-5