poles
Definition
Poles are the two ends of a magnet. The north pole is where the magnetic field lines enter the magnet, and the south pole is where they exit. The poles of a magnet attract each other, but opposite poles repel each other.
The strength of a magnet's magnetic field is strongest at the poles. This is because the magnetic field lines are more concentrated at the poles.
The Earth is also a magnet. The Earth's north pole is where the magnetic field lines enter the Earth, and the Earth's south pole is where they exit. The Earth's magnetic field is what deflects solar wind and cosmic rays, which protects life on Earth from harmful radiation.
How can the word be used?
The North Pole is the northernmost point on the Earth.
Different forms of the word
Noun: a long, slender, cylindrical object, such as a length of wood or metal.
Verb: to propel or drive something forward with a pole.
Adjective: relating to or denoting the north or south pole of the Earth.
Adverb: in a northerly or southerly direction.
Pronoun: (informal) used to refer to the north or south pole of the Earth.
Etymology
The word "pole" comes from the Latin word "polus", which means "axis" or "pivot". The original meaning of the word was "a long, slender object that is used to support something", such as a tent pole or a flagpole. The meaning of the word gradually expanded to include the meaning of "the north or south pole of the Earth".
Question
Where can poles be found?
AQA Science Exam Question and Answer
Question:
Explain the concept of magnetic poles in magnets and their role in magnetic attraction and repulsion. Provide examples of everyday applications of magnets based on their pole interactions.
Answer:
Magnetic poles are regions on a magnet where the magnetic force is strongest. There are two types: the North Pole and the South Pole. Like poles repel each other, while opposite poles attract.
In a magnet, the magnetic field lines emerge from the North pole and reenter at the South pole, forming a continuous loop. This flow of field lines creates the characteristic behaviour of magnetic attraction and repulsion.
Everyday applications of magnets rely on pole interactions. Refrigerator magnets stick to metal surfaces due to magnetic attraction. Doorbells utilise magnets to create a temporary circuit, producing a sound when the magnetic field is disrupted upon pressing the button.
Electromagnetic devices like electric motors and transformers rely on changing magnetic fields, leading to pole interactions that induce current or voltage. Maglev trains use repulsion between magnets to levitate and propel the train, reducing friction and increasing speed.