Making a Magnet Using the Stroke Method скачать в хорошем качестве

Making a Magnet Using the Stroke Method

#magnet #ngscience #makingmagnets #strokemethod #forces #magneticforce https://ngscience.com Here we have a bar magnet, metal nail and some metal staples. By holding the nail near the staples, we can see that the nail is not magnetic. We can use the bar magnet to magnetise the metal nail by stroking one of the magnet poles along the nail in the same direction like this... When the nail is brought near the staples, some the staples are now attracted to the nail. It has been magnetized! What could you do to increase the strength of the magnetized nail? Create your own investigation to find out! What is Magnetic Force? Place a magnetic compass on a table and observe the compass needle. What do you notice? A magnet is an object with magnetic force. Magnetic force occurs in an object due to the motion of electrically-charged particles. The compass needle is a magnet. When allowed to spin freely, a magnet will align with the Earth’s natural magnetic field. The north pole of the magnet will come to rest pointing in the direction of north. Magnetic force is a non-contact force. It can act through solids, liquids and gases at a distance. Magnetic force can attract objects made of certain metals such as iron and nickel. Magnetic force cannot attract objects made of non-magnetic materials such as plastic, wood, rubber or glass. A magnet has two poles – a North pole and a South pole. It is at each pole that the magnetic force is the strongest. When the like poles of two magnets are brought together, they push or repel each other. When unlike poles are brought together, they pull or attract each other. Many objects make use of magnetic force. Some doors use magnets to keep them closed. Magnets are used to stick notes and photographs to refrigerators. They are used in electric motors, loudspeakers and for storing data on computer disks. Magnetic force can also be created when current flows through a conductor such as a wire. These types of magnets are called electromagnets and can generate a magnetic force much greater than ordinary magnets. These powerful magnets are used in a variety of applications. Recycling plants use electromagnets to collect scrap metal. Magnetic Resonance Imaging (MRI) machines use electromagnets to generate very strong magnetic forces that interact with tissues in our bodies. Computers collect data on the interactions and create images of the internal structures of our bodies without the need for surgery.