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Ch.14- Test 1 (2nd 9 wks) Review

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1 Ch.14- Test 1 (2nd 9 wks) Review
Magnetism

2 How would you label pole 2 in the picture below?

3 The picture below shows a piece of iron before it has become magnetized. What will the domains (groups of atoms) look like after it is magnetized?

4 What is responsible for generating Earth’s magnetic field?

5 How can a student increase the strength of the magnetic field around the electromagnet?

6 Which statement best compares the magnetic field of Earth to the magnetic field of a bar magnet?
A. Magnetic field lines around Earth are symmetrical but magnetic field lines around a bar magnet are not symmetrical. B. Magnetic field lines around Earth are in a circular pattern but magnetic field lines around a bar magnet extend away from the magnet. C. Magnetic field lines for both Earth and a bar magnet are generated from convection currents. D. Magnetic field lines for both Earth and a bar magnet emerge from their north poles.

7 What causes the northern lights?

8 A student made an electromagnet by wrapping copper wire around an iron nail. The student then connected each end of the electromagnet to the opposite terminals of a battery. The electromagnet will best function as a magnet as long as A. electric current flows through the wire. B. electrical energy is transformed into mechanical energy. C. electrical energy is transformed into potential energy. D. electric current flows through the nail.

9 A student has a magnet and wire coil
A student has a magnet and wire coil. Draw a diagram that best shows how the student can use the magnet and wire coil to produce electricity?

10 A student built a prototype of an electromagnet
A student built a prototype of an electromagnet. The electromagnet was designed to produce a strong magnetic field. How can the student best test the strength of the electromagnet? A. place a thermometer near the electromagnet, and record changes in the air temperature surrounding the electromagnet B. connect the electromagnet to a simple circuit that contains a battery and light bulb, and then observe if the bulb glows C. attach an iron bar to a spring scale, place the iron bar near the electromagnet, and record the force reading on the spring scale D. place the electromagnet on an electronic balance, and record its mass in kilograms

11 Draw a diagram that shows a magnetic field most similar to the magnetic field of Earth?

12 Draw an electromagnet, label the 3 parts, and draw the magnetic field lines.

13 As the magnet moves back and forth, the meter indicates

14 Compare the magnetic field strength of a permanent magnet and an electromagnet?

15 A student coils a copper wire around a bar magnet
A student coils a copper wire around a bar magnet. Which action will cause the device to generate electricity?

16 Draw a diagram that shows an apparatus that is correctly set up to produce and measure electricity?

17 What device is the diagram representing?

18 Draw the magnet that would provide the best example for the magnetic poles and magnetic fields of Earth?

19 True or False The magnetic domain is the area around a magnet where the force acts.

20 The south pole of a magnet ________.
Repels a paper clip Attracts a north pole Repels a north pole Attracts another south pole

21 True or False Moving a wire through a magnetic field creates an electric current in a wire.

22 When you break an iron magnet into
two pieces, you get ___________________. Two south poles Two north poles A piece of iron that is no longer magnetic Two north poles and south poles

23 The location of the strongest magnetic field
is the _________________. Center of the magnet Magnetic domains Magnetic fields Magnetic poles

24 The region around a magnet where the
magnetic forces act is the ________________. Electromagnet pole Magnetic domain Magnetic field Magnetic pole

25 The magnetic domains of the atoms in
a magnet are ______________________. Arranged randomly Lined up Negatively charged Positively charged

26 An electromagnet is ___________________.
A permanent magnet Made with bar magnets Attracts all metal substances Only operating when the current is on

27 A current carrying wire wrapped around an
iron core is called an ___________________. Generator Conductor Transformer Electromagnet

28 Changing the current changes the
________________ of an electromagnet. Strength Direction Charge Strength and direction

29 Unlike poles of a magnet ____________.

30 _______________________ is Earth’s magnetic field
extended into space.

31 Homing pigeons have pieces of _________________
in their brains to help them find their way home.

32 What happens to the magnetic domains
of a magnetized paper clip when the magnetizing magnet is removed?

33 Name two ways of increasing the magnetic
field of an electromagnet.

34 True or False When you bring the south ends of two magnets close together, they repel each other.

35 True or False A paper clip magnetized by a bar magnet is permanently magnetized.

36 True or False The field of a magnet is weakest at its poles.

37 True or False The magnetic domains of a permanent magnet are arranged randomly.

38 True or False A current carrying wire produces a magnetic field.

39 True or False The strength of an electromagnet can be increased by reducing the number of turns on the wire coil so that more current can flow.

40 True or False The Earth’s magnetic field is called the magnetic domain.

41 True or False Because of the magnetic field, magnets do have to touch to affect each other.


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