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Physics 9 Lesson 23 helping 9th graders master the knowledge of Magnetic Spectrum – Magnetic Field Lines. Simultaneously, quickly solve Physics exercises 9 Chapter II on pages 63, 64.

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The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

Magnetic spectra are specific images of magnetic field lines.

The spectrum can be obtained by sprinkling iron filings on a clear plastic sheet placed in a magnetic field and tapping lightly

– Where the iron filings are thick, the magnetic field is strong

– Where iron filings are sparse, the magnetic field is weak

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

Magnetic lines of force have a definite direction.

– Outside the magnet, the magnetic lines of force go out from the north pole (N), into the south pole (S) of the magnet.

– Where the magnetic field is stronger, the line of force is thick, where the field is weaker, the line of force is thin.

Sprinkle a layer of iron filings evenly on a clear, flat plastic sheet. Place this plastic sheet on top of a bar magnet and tap it gently. Observe the image of iron filings that have just been formed on the plastic sheet (Figure 23.1).

How are the iron filings around the magnet arranged?

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

Suggested answers

The iron filings around the magnet are arranged in curved lines that connect from one pole to the other of the magnet. The further away from the magnet, the thinner these lines become.

Comment on the arrangement of the magnet needles along a magnetic field line (Figure 23.3).

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

Suggested answers

The magnet needles lie along a line of magnetic field oriented in a certain direction.

Which pole does the magnetic field lines enter and which poles go out of the bar magnet?

Suggested answers

Outside the bar magnet, the magnetic lines of force all go out from the north pole and into the south pole of the bar magnet.

Figure 23.4 gives a picture of the magnetic spectrum of a U-magnet. Based on that, draw its magnetic field lines. Comment on the form of magnetic field lines in the interval between two magnetic poles.

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

Suggested answers

Draw magnetic field lines as shown below. The lines of force between the two poles are almost parallel lines.

Know the direction of a magnetic field line of the bar magnet as shown in Figure 23.5. Identify the names of the poles of the bar magnet?

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

Suggested answers

The B end of the bar magnet is the South pole.

Figure 23.6 shows two spectroscopic images of two magnets placed close together. Draw some lines of magnetic field and indicate their direction

Suggested answers

The magnetic field lines shown in the figure are from the north pole of the left magnet to the south pole of the right bar magnet.

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

The direction of the magnetic field lines of two magnets is shown in Figure 23.3. Look at the picture, tell the names of the poles of the magnet. Lesson 23.4 page 52 Workbook (SBT) Physics 9 – Lesson 23. Magnetic spectrum – Magnetic field lines

The direction of the magnetic field lines of two magnets is shown in Figure 23.3. Look at the figure, name the poles of the magnet.

The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

– In figure (a): The A end of the bar magnet is the South pole.

– On the picture (b): The 2nd end of the U-shaped magnet is the North pole.

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Students need to remember and grasp the knowledge of the word spectrum, magnetic field lines and the right fist rule.

1. Magnetic Spectrum – Magnetic Field Line

From the spectrum: is a specific image of magnetic field lines, which can be obtained from the spectrum by sprinkling iron filings on a clear plastic sheet placed in a magnetic field and tapping lightly.

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• Magnetic field lines:

Each magnetic field line has a definite dimension. Outside the magnet, the magnetic lines of force go out from the north pole (N), into the south pole (S) of the magnet.

– The magnetic spectrum outside the current-carrying wire and outside the bar magnet is the same

2. Right fist rule

Grasp the right fist, then place the four fingers in the direction of the current flowing through the coils, the thumb will show the direction of the magnetic field line inside the coil.

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Example 1: Which of the following is used to obtain the spectrum?

A. Spread sand on a plastic sheet placed in the magnetic field of the magnet and tap lightly.

B. Sprinkle iron filings on the plastic sheet placed in the magnetic field of the magnet and tap lightly

C. Using a magnet needle, apply ink to the magnet needle to draw on the paper.

D. Place the magnet bar straight near the wall and shine the light on the magnet bar

Solution guide:

The answer is NO

Because iron is a magnetic metal, under the influence of a magnetic field the small iron filings will arrange into curved lines connecting from one pole to the other. It’s a universal word

Example 2: The magnetic lines of force outside the bar magnet, wire with current flowing through are:

A. Circles centered in the center of the bar magnet

B. Concentric circles

C. Curves

D. Straight lines

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Solution guide:

ANSWER C

The magnetic lines of force outside the bar magnet (also outside the coil) are curved lines, connecting from one pole to the other.

Example 3: Lien performed an experiment on magnetic fields. The experiment that Lien performed is depicted in the figure. When a direct current flows through the coil, you see the needle magnet is pushed away. B. What is the direction of the current passing through the coil?

Solution guide:

The current in the coil has direction from A to B .

Since the magnet needle is pushed away, the B end of the coil must be the North pole. That is, the magnetic field line of the spool swings out from the B end of the spool. Using the right-hand rule to deduce the direction of current through the coil has the direction from A to B

Question 1: What does the rapidity, sparseness of magnetic field lines on the same figure tell us?

A. The strength and weakness of the magnetic field. The faster the magnetic field line, the stronger the magnetic field and vice versa

B. The strength and weakness of the magnetic field. The faster the magnetic field line, the weaker the magnetic field and vice versa

C. Strength and weakness of current. The faster the magnetic field line, the stronger the current there and vice versa

D. Strength and weakness of amperage. The faster the magnetic field line, the weaker the current there and vice versa

Show answers

Answer A

Where the magnetic field is strong, the line of force is thicker, where the field is weak, the line of force is thinner.

Verse 2: Magnetic lines of force have a definite direction. On the outside of the conduit (with current flowing through) they are curves.

A. Exit from the cathode and enter from the anode of the coil

B. Exit from the North pole and enter from the South pole of the coil

C. Exit from the South pole and enter from the North pole of the coil

D. Coming out from the anode and entering from the cathode of the coil

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The answer is NO

The magnetic spectrum outside the current-carrying wire and outside the bar magnet is the same. They are all public roads that go out from the North Pole and into the South Pole

Question 3: The right fist rule is used to determine.

A. Direction of current in the conductor

B. The direction of the magnetic field lines in the magnet

C. Direction of magnetic field lines in electric circuit

D. The direction of the magnetic field lines in the inner tube

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EASY ANSWER

The right-hand grip rule is used to determine the direction of the magnetic field lines inside the coil when the direction of the current flowing through the coil is known.

Question 4: Which of the following statements is correct regarding the right fist rule?

A. Holding the right fist so that the four fingers are clenched to indicate the direction of the current through the wire, then the thumb outstretched indicates the direction of the magnetic field inside the coil.

B. Hold the right fist so that the four fingers are clenched to indicate the direction of the current through the coil, then the thumb is extended to indicate the direction of the field of force from the outside of the coil.

C. Make a fist with the right hand, then the four fingers together indicate the direction of the magnetic field lines from the inside of the tube.

D. Make a fist with the right hand, then the thumb is outstretched indicating the direction of the magnetic field line inside the tube.

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Answer A

The right hand rule is used to determine the direction of the magnetic field lines in the inner tube

Question 5: When using the right-hand rule need to know?

A. Current in the coil

B. Rated voltage applied to the two ends of the coil

C. Direction of current in the coil

D. Length of conduit

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ANSWER C

When using the right hand rule, pay attention to the four fingers in the direction of the current flowing through the loops. Therefore, it is necessary to know the direction of the current in the coil.

Question 6: When an electric current is passed through a coil of wire, a magnetic field line appears around the coil. If you add an iron core to that wire, will the direction of the magnetic field change hand? Why?

Show answers

The direction of the magnetic field lines does not change.

Because the iron core only increases the magnetism of the coil, it does not change the magnetic polarity of the coil.

Question 7: During the practical class on magnetism, the students of class 8A did an experiment described as shown below. When the K lock is closed, what will the magnet needle look like?

Show answers

When the key K is closed, current will flow through the coil. Applying the right hand rule, the end of the coil near the magnet needle is the North pole. The poles of the magnet needle and the spool of the same name will repel each other, and the magnet needle will be pushed away.

Verse 8: End A of the coil is the North pole. How do you want the A pole of the wire to be the South pole?

Show answers

In order for the A end to turn into the South pole, we just need to reverse the direction of the current passing through the coil. Because when reversing the current, the direction of the magnetic field line also changes, and the magnetic pole of the coil also changes

Question 9: During the physics class, Mr. Vu did an experiment to determine the polarity of a magnet needle. The experiment is depicted as shown in the figure. When Mr. Vu closes the K switch, the X pole of the magnet needle is attracted to the B end of the wire. What are the two poles X and Y? Why?

Show answers

X is the South Pole, Y is the North Pole

Because according to the right hand rule, the B end of the pipe is the North pole. The end of B attracts the X pole of the magnet needle, so X is the South pole and Y will be the North pole

Question 10: Observing the magnetic spectrum of the straight bar magnet (in the picture), what conclusions do you have about the magnetic field of this bar magnet?

Show answers

The magnetic field at the ends of the bar magnet is strongest, because there the magnetic field lines are dense. The middle of the bar is the weakest, because there the magnetic lines of force are very sparse.

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The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet
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The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet

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The figure shows what is the direction of a line of force for a straight magnet at the x and y ends of the magnet
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