Magnetic fields

• A magnet is an object capable of exerting a magnetic force.
• Magnets have two poles: a north pole and a south pole.
• In a magnet, the end that is attracted to the Earth's magnetic north pole is referred to as the north pole.
• Magnets affect each other without touching due to the rules of magnetism.
• Induced and permanent magnetism are two types of magnetism.
• A force exerted between two objects, even when they are not touching, such as the force of gravity, is known as a non-contact force.
• Magnetic forces are non-contact forces.
• Electromagnets, electromagnetic induction, transformers, and sample exam questions on magnetism and electromagnetism are topics related to magnetism.
• In a magnet, the end that is attracted to the Earth's magnetic south pole is referred to as the south pole.
• Two magnets will either attract or repel each other in the following way: like poles (N-N or S-S) repel, while unlike poles (N-S or S-N) attract.
• Magnetic force is strongest near the magnet's poles.
• Magnetism is due to the magnetic fields around magnets, which can be investigated by looking at the effects of the forces they exert on other magnets and magnetic materials.
• Iron, steel, nickel and cobalt are magnetic and can be attracted to a magnet.
• Permanent magnets are made from a magnetic material and their magnetism cannot be turned on or off, unlike an electromagnet.
• Permanent magnets always cause a force on other magnets, or on magnetic materials.
• Iron filings lose most or all of their magnetism when they are removed from the magnetic field.
• A permanent magnet produces its own magnetic field and the magnetic field cannot be turned on and off, it is there all the time.
• The magnetic field of an induced magnet is lost when the magnet is moved out of the magnetic field.
• you can only show that an object is a permanent magnet by checking if it repels another magnet.
• An induced magnet only becomes a magnet when it is placed in a magnetic field.
• Like all induced magnets, iron filings are only attracted by other magnets, they are not repelled.
• Iron filings become induced magnets when they are near a permanent magnet.
• A permanent magnet can attract or repel another permanent magnet, but it cannot attract a magnetic material and it is not repelled by it.
• An induced magnet is a temporary magnet, made from a magnetic material placed in a magnetic field.
• The magnetic field of an induced magnet is quickly lost when the magnet is removed from the magnetic field.
• Bar magnets and horseshoe magnets are examples of permanent magnets.
• Magnetic fields are the fields around magnets that can be investigated by looking at the effects of the forces they exert on other magnets and magnetic materials.
• A magnetic field is an area surrounding a magnet that can exert a force on magnetic materials.
• A magnetic field is invisible, but it can be detected using a magnetic compass.
• A compass contains a small bar magnet on a pivot so that it can rotate.
• The compass needle points in the direction of the Earth's magnetic field, or the magnetic field of a magnet.
• Magnetic fields can be mapped out using small plotting compasses.
• The needle of a plotting compass points to the south pole of the magnet.
• The behaviour of a compass shows that the Earth has a magnetic field.
• The Earth's core, which is made from iron and nickel, produces this magnetic field.
• Magnetic field lines are imaginary lines which indicate the direction of force caused by a magnet.
• An arrow on the line shows the force direction on a magnetic north pole, so points from north to south.
• Magnetic field lines never cross each other.
• The closer the lines, the stronger the magnetic field.
• The lines have arrowheads to show the direction of the force exerted by a magnetic north pole.