Interactive Graded Test on Magnetism

This is an interactive test that will automatically check your answers and calculate your grade. This test has 25 questions and is based on material from the Magnetism section of lessons:

• Magnetism
• Magnetism and Lorentz Force
• Magnets
• Detection of a Magnetic Field
• Factors Determining Magnetic Properties
• Magnetic Materials
• Electromagnetism
• Electromagnetic Devices and Inventions

It is a good idea to study these lessons before taking this graded test.

QUIZ

Self-check your understanding

1. What does the movement of an electric charge cause?

   The movement of a magnetic chargeGood try, but not right. Select another answer.An electron or protonSorry, not correct. Try another button.A magnetic fieldThat is correct.

2. What happens when two objects with magnetic fields are brought near each other?

   The magnetic force either causes attraction or repulsionThat is correct.The magnetic force will cause electrical chargesGood try, but not right. Select another answer.The objects will become magnetsSorry, not correct. Try another button.

3. Is a magnet a dipole or monopole?

   Monopole, because it is one magnetGood try, but not right. Select another answer.Dipole, because it has two polesThat is correct.It depends if the poles are like or differentSorry, not correct. Try another button.

4. Why is a moving electron affected by a magnetic field?

   The magnetic field of the electron interacts with the external fieldThat is correct.The motion of the electron turns it into a protonGood try, but not right. Select another answer.The magnetic field creates an electric fieldSorry, not correct. Try another button.

5. What is the force on a wire carrying current in a magnetic field called?

   Right Hand RuleGood try, but not right. Select another answer.Newton ForceSorry, not correct. Try another button.Lorentz ForceThat is correct.

6. What is the direction of the force of an electron moving through a magnetic field?

   Just the opposite of that for an electric currentGood try, but not right. Select another answer.The direction as indicated by the Right Hand RuleThat is correct.The same direction as the magnetic fieldSorry, not correct. Try another button.

7. What does a magnet repel?

   The opposite pole of another magnetThat is correct.Iron, nickel and cobaltGood try, but not right. Select another answer.The same pole of another magnetSorry, not correct. Try another button.

8. What happens if you cut a magnet in half?

   It destroys its magnetismGood try, but not right. Select another answer.You get a North Pole magnet and a South Pole magnetSorry, not correct. Try another button.You get two magnets, each with a N and S poleThat is correct.

9. Why does a compass point north?

   The shape of the Earth causes it to do soGood try, but not right. Select another answer.There is a large deposit of iron right at the North PoleSorry, not correct. Try another button.The Earth is a large magnet with a magnetic pole near the North PoleThat is correct.

10. How does a compass aid in navigation?

    It detects the Earth's North magnetic poleThat is correct.It detects the number of gauss from the EarthGood try, but not right. Select another answer.It is only used to detect large magnetsSorry, not correct. Try another button.

11. What can iron filings show?

    Which direction is northGood try, but not right. Select another answer.If there is a compass nearbySorry, not correct. Try another button.The pattern of a magnetic fieldThat is correct.

12. What does a gaussmeter measure?

    North or SouthGood try, but not right. Select another answer.The number of gauss from a magnetic sourceThat is correct.The number of magnets in the areaSorry, not correct. Try another button.

13. What element has all or most electrons aligned in the same direction?

    NickelThat is correct.KryptonGood try, but not right. Select another answer.Stainless steelSorry, not correct. Try another button.

14. Why isn't rusty iron attracted to magnets very well?

    Rust is too heavyGood try, but not right. Select another answer.The molecular arrangement diminishes the magnetic responseThat is correct.There is too much water in rustSorry, not correct. Try another button.

15. What is a domain in a metal?

    A collection of atoms or molecules arranged in a specific orientationThat is correct.There are no domains in metalsGood try, but not right. Select another answer.It is the range of the magnetic fieldSorry, not correct. Try another button.

16. Why wouldn't carbon-hardened steel be very magnetic?

    It is too hard to be attracted to a magnetGood try, but not right. Select another answer.Liquids cannot be magnetsSorry, not correct. Try another button.Carbon is diamagnetic, thus neutralizing the ferromagnetic steelThat is correct.

17. Why doesn't aluminum stick to a magnet?

    The attraction is extremely weakThat is correct.Aluminum includes Teflon, which will not stickGood try, but not right. Select another answer.Aluminum magnets are very commonSorry, not correct. Try another button.

18. Is it possible to levitate a small animal?

    Only metals can be levitatedGood try, but not right. Select another answer.If the animal is lighter than airSorry, not correct. Try another button.Yes, since organic material is diamagneticThat is correct.

19. If you doubled the number of coils and doubled the voltage, what would be the increase in magnetic strength?

    It would remain the same, since 2 / 2 = 1Good try, but not right. Select another answer.It would be 4 times as strong, since 2 x 2 = 4That is correct.You can't increase magnetism by increasing the voltageSorry, not correct. Try another button.

20. Why should the wire around the iron core be insulated?

    So that you don't create a short circuitThat is correct.To keep the iron from getting too warmGood try, but not right. Select another answer.To insulate the magnetismSorry, not correct. Try another button.

21. Why does an iron core increase the magnetic field of a coil of wire?

    The iron atoms line up to add to the magnetic fieldThat is correct.Iron attracts things, including magnetic fieldsGood try, but not right. Select another answer.The iron core actually decreases the field, allowing it to be turned offSorry, not correct. Try another button.

22. What contributes to increasing the strength of an electromagnet?

    Electric current through the wireGood try, but not right. Select another answer.The number of turns of wire around the iron coreSorry, not correct. Try another button.Both of the aboveThat is correct.

23. What causes the loudspeaker cone to vibrate?

    Sounds that come from the radio or TVGood try, but not right. Select another answer.The movement of a magnet within a coil of wire with varying current running through itThat is correct.The movement of electrons in the electromagnetSorry, not correct. Try another button.

24. If moving a wire through a magnetic field creates electricity, how else can you create electricity?

    Moving a magnets next to each otherGood try, but not right. Select another answer.Moving a magnet through a wire coilThat is correct.Moving both the magnet and wire in the same directionSorry, not correct. Try another button.

25. How does a television set use electromagnets?

    They are used to pick up junked cars seen on televisionGood try, but not right. Select another answer.They direct the electron beam to locations on the screenThat is correct.Electromagnets hold the set to the floorSorry, not correct. Try another button.

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