Definition Of Magnetism Quiz
A review of chapter 21.
Questions and Answers
- 1.
A compass points north because
- A.
There are more magnetic materials in the north.
- B.
That is the only directionin which it can point.
- C.
It is repelled by the South Pole.
- D.
It aligns with Earth's magnetic field.
Correct Answer
D. It aligns with Earth's magnetic field.Explanation
A compass points north because it aligns with Earth's magnetic field. The Earth has a magnetic field that is generated by its core, which acts like a giant magnet. The compass needle is a small magnet that is free to rotate. It aligns itself with the Earth's magnetic field, with one end pointing towards the magnetic North Pole and the other end pointing towards the magnetic South Pole. This alignment allows the compass to indicate the direction of north.Rate this question:
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- 2.
Where is the field of a magnet strongest?
- A.
Near the north pole
- B.
Near the south pole
- C.
Near both poles
- D.
Near the middle
Correct Answer
C. Near both polesExplanation
The field of a magnet is strongest near both poles because that is where the magnetic force lines are most concentrated. The magnetic field lines originate from one pole, flow through the magnet, and then return to the other pole. The density of these lines is highest near the poles, indicating a stronger magnetic field. In contrast, the field is weaker near the middle of the magnet where the force lines are more spread out.Rate this question:
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- 3.
If you cut a magnet in half, you have
- A.
No magnets.
- B.
Two half magnets.
- C.
One magnet.
- D.
Two magnets.
Correct Answer
D. Two magnets.Explanation
When a magnet is cut in half, each half still retains its magnetic properties and becomes an individual magnet with its own north and south poles. Therefore, cutting a magnet in half results in two magnets.Rate this question:
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- 4.
A magnet's field lines always start near the magnet's
- A.
Middle.
- B.
South pole.
- C.
North pole.
- D.
Side.
Correct Answer
C. North pole.Explanation
A magnet's field lines always start near the magnet's north pole. This is because the north pole of a magnet is where the magnetic field lines emerge from the magnet and form a loop, creating a magnetic field around it. The field lines then extend outward from the north pole and curve back towards the south pole, completing the loop. Therefore, the field lines always begin near the north pole of a magnet.Rate this question:
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- 5.
A ferromagnetic material is
- A.
Always a magnet.
- B.
A magnet if its domains are aligned.
- C.
A magnet if its domains are not aligned.
- D.
Never a magnet.
Correct Answer
B. A magnet if its domains are aligned.Explanation
A ferromagnetic material is a magnet if its domains are aligned. This means that the magnetic moments of the atoms within the material are all pointing in the same direction, creating a strong magnetic field. When the domains are not aligned, the material is not magnetized.Rate this question:
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- 6.
An iron bar is placed in a solenoid to
- A.
Decrease the voltage.
- B.
Increase the voltage.
- C.
Increase the magnetic field strength.
- D.
Decrease the magnetic field strength.
Correct Answer
C. Increase the magnetic field strength.Explanation
When an iron bar is placed in a solenoid, it increases the magnetic field strength. This is because the iron bar becomes magnetized and the magnetic field lines of the solenoid become concentrated within the bar. The presence of the iron bar enhances the magnetic field, resulting in an increase in its strength. This phenomenon is known as magnetic induction and is commonly used to strengthen the magnetic field in solenoids and electromagnets.Rate this question:
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- 7.
Which of these cannot increase the strength of an electromagnet?
- A.
Making the loops smaller in the coil
- B.
Placing an iron bar in the coil
- C.
Winding more loops in the coil
- D.
Increasing the current in the coil
Correct Answer
A. Making the loops smaller in the coilExplanation
Making the loops smaller in the coil cannot increase the strength of an electromagnet because the strength of an electromagnet is directly proportional to the number of loops in the coil. Increasing the number of loops increases the magnetic field produced by the electromagnet, resulting in a stronger magnet. Therefore, making the loops smaller would decrease the number of loops and consequently decrease the strength of the electromagnet.Rate this question:
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- 8.
An electric generator converts
- A.
Electrical energy into mechanical energy.
- B.
Power into energy.
- C.
Mechanical energy into electrical energy.
- D.
Energy into power.
Correct Answer
C. Mechanical energy into electrical energy.Explanation
An electric generator converts mechanical energy into electrical energy. When a generator is turned, it uses mechanical energy to rotate a magnet within a coil of wire. This motion induces a flow of electrons in the wire, creating an electrical current. Therefore, the generator transforms the mechanical energy from its source into electrical energy that can be used to power devices or stored for later use.Rate this question:
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- 9.
What effect does a magnetic field have on a charge moving perpendicular to the field?
- A.
It has no effect.
- B.
It pulls the charge forward.
- C.
It pushes the charge backward.
- D.
It pushes the charge perpendicularly to the field and the charge's velocity.
Correct Answer
D. It pushes the charge perpendicularly to the field and the charge's velocity.Explanation
A magnetic field exerts a force on a moving charge that is perpendicular to both the field and the charge's velocity. This is known as the Lorentz force. The direction of the force is determined by the right-hand rule, where the thumb points in the direction of the charge's velocity, the fingers point in the direction of the magnetic field, and the palm shows the direction of the force. Therefore, the correct answer is that the magnetic field pushes the charge perpendicularly to both the field and the charge's velocity.Rate this question:
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- 10.
A galvanometer is a device used to measure
- A.
Current.
- B.
Resistance.
- C.
Voltage.
- D.
Magnetic field strength.
Correct Answer
A. Current.Explanation
A galvanometer is a device used to measure current. It works based on the principle of electromagnetic induction, where a current-carrying coil experiences a force when placed in a magnetic field. This force causes the coil to move, and the amount of movement is proportional to the current flowing through it. By measuring the displacement of the coil, the current can be determined. Therefore, a galvanometer is specifically designed and calibrated to measure current accurately.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jun 01, 2011Quiz Created by
Briannaandlizzy
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