Which of the following will prove that a metal bar is a permanent magnet?*1 pointit attracts another magnetit attracts both ends of a compass needleit conducts electricityit repels another magnet
Question
Which of the following will prove that a metal bar is a permanent magnet?*1 pointit attracts another magnetit attracts both ends of a compass needleit conducts electricityit repels another magnet
Solution 1
The proof that a metal bar is a permanent magnet can be shown if it repels another magnet. This is because only magnets have the property to both attract and repel other magnets. While it's true that magnets can attract both ends of a compass needle and attract other magnets, these properties are not exclusive to permanent magnets. Non-magnetized metals can also attract magnets. Conducting electricity is not related to magnetism, so it's not a valid proof. Therefore, the best answer is "it repels another magnet".
Solution 2
The best way to prove that a metal bar is a permanent magnet is if it repels another magnet. Here's why:
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If a metal bar attracts another magnet, it could be a magnet itself, but it could also be a ferromagnetic material like iron, which is attracted to magnets but is not a magnet itself.
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If a metal bar attracts both ends of a compass needle, it could indicate that it's a magnet. However, it could also mean that the bar is made of a magnetic material that the compass needle is responding to.
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If a metal bar conducts electricity, this doesn't necessarily mean it's a magnet. Many metals like copper and aluminum conduct electricity but are not magnetic.
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If a metal bar repels another magnet, this is a clear sign that the bar is a magnet itself. Only magnets have the ability to repel other magnets. The north pole of one magnet will repel the north pole of another, and the south pole will repel the south pole. This is a definitive test for magnetism.
Similar Questions
Which of the following statements about permanent magnets is incorrect?They produce their own magnetic fields and always have a north pole and a south poleThe force between two permanent magnets will increase when they are brought closer to one anotherThey can be attracted to or repelled by other permanent magnetsUnder certain circumstances, they will only be attracted to other permanent magnets5An iron nail is initially unmagnetised. Which one of the following things will occur when it is brought closer to the north pole of a permanent bar magnet?Nothing will happen since the iron nail is not a permanent magnetThe iron nail will be repelled by the bar magnetThe iron nail will be permanently magnetisedThe end of the nail which is placed closest to the north pole of the bar magnet will become an induced south pole
An iron nail is initially unmagnetised. Which one of the following things will occur when it is brought closer to the north pole of a permanent bar magnet?Nothing will happen since the iron nail is not a permanent magnetThe iron nail will be repelled by the bar magnetThe iron nail will be permanently magnetisedThe end of the nail which is placed closest to the north pole of the bar magnet will become an induced south pole
What will happen when the north pole of one bar magnet is brought close to the north pole of a second bar magnet?There will be an attractive force between the two north polesThe magnets will accelerate towards one anotherThere will be no force between the two north polesThere will be a repulsive force between the two north poles2A student is experimenting with a bar magnet and a plotting compass. As she moves the plotting compass around the bar magnet, the needle inside the compass rotates. Which one of the following statements is correct?The needle always points opposite to the direction of the magnetic fieldThe needle always points directly towards the north pole of the bar magnetThe needle always points directly towards the south pole of the bar magnetThe needle always points in the direction of the magnetic field3Which of the following statements is incorrect?The Earth’s magnetic south pole is in the Southern HemisphereThe magnetic field of the Earth is stronger at the poles than it is at the EquatorThe magnetic field of the Earth (and any magnet) is stronger where the field lines are closer togetherAs long as there aren’t any strong magnets nearby, a compass needle will always point in the direction of the Earth’s magnetic field4Which of the following statements about permanent magnets is incorrect?They produce their own magnetic fields and always have a north pole and a south poleThe force between two permanent magnets will increase when they are brought closer to one anotherThey can be attracted to or repelled by other permanent magnetsUnder certain circumstances, they will only be attracted to other permanent magnets5An iron nail is initially unmagnetised. Which one of the following things will occur when it is brought closer to the north pole of a permanent bar magnet?Nothing will happen since the iron nail is not a permanent magnetThe iron nail will be repelled by the bar magnetThe iron nail will be permanently magnetisedThe end of the nail which is placed closest to the north pole of the bar magnet will become an induced south pole
A magnetic material will become magnetized if:it is placed next to a compassits magnetic domains all face different directionsmost of its magnetic domains face the same directionit is placed next to a piece of iron
In a bar magnet the magnetic force seems to come from each end. The ends of a bar magnet are called the __________. What one word completes the sentence?
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