10 EXAMPLES OF MAGNETIC FORCE
Answers
Examples of Magnetic Force
(i). Compass
(ii). MRI Scanners
(iii). Electric Motor
(iv). Speakers
(v). Refrigerators
(vi). Computer
(vii). Microwave
(viii). Cars
(ix). Trains
(x). Fans
A compass is a tool for finding direction. It has a magnetic needle mounted on a pivot or short pin. The needle can spin freely, and always points north. Have you ever been on a hiking or camping trip? If you did, then, at some point you must have used a compass to help find your way; because a compass always points North. But have you ever wondered why is it so? Well, it’s all caused by the power of magnetism!
(ii). MRI Scanners
Magnetic resonance imaging (MRI) is one of the most common medical imaging techniques used at many diagnostic centers across the world. These MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body.
(iii). Electric Motor
Ever wondered how Hand-held hair dryers, electric knives, electric razors, hair, and beard trimmers work? It’s all with the help of Magnetic force. An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a magnetic force with a magnet that causes movement or spinning that runs the motor.
(iv). Speakers
Ever wondered how a speaker works? In order to convert an electrical signal into an audible sound, speakers contain an electromagnet (a metal coil that creates a magnetic field when an electric current flows through it). This means that it is, in turn, attracted to and repelled from the permanent magnet, vibrating back and forth.
(v). Refrigerators
Have you wondered how the refrigerator functions? How the refrigerator door remains closed? the weak ferromagnetic ceramics like barium ferrite or strontium ferrite present in the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeping the doors closed.
(vi). Computer
Well, data are stored in hard disk drives on the basis of magnetism. There’s a coating of magnetic material on the disc; consisting of billions or even trillions of tiny magnets. With the use of an electromagnetic head, data is stored in the disc.
(vii). Microwave
Microwave ovens also work with the help of the magnetic force. They use a device called a magnetron to generate the power for cooking. A magnetron is a vacuum tube designed to cause electrons to circulate in a loop inside the tube. A magnet is placed around the tube to provide the magnetic force that causes the electrons to move in a loop.
(viii). Cars
We see cars everywhere around us, but have you ever wondered what makes it move from one point to another? It is due to Magnetic force. Cars use electromagnetic properties produced inside the engine to create movement, while with fossil fuel engines, the energy is obtained by the ignition. By turning the magnetic coil attached to an axle, the wheels of the car also turn and the car moves.
(ix). Trains
Maglev is a system of train transportation that uses two sets of magnets, one set to repel and push the train up off the track, and another set to move the elevated train ahead, taking advantage of the lack of friction. The next you travel by train, you’ll be amazed to be traveling on huge magnets.
(x). Fans
The magnets in the rotor of the fan are repelled by those in the stator. As they manage to repel themselves away to the maximum permitted by the movement of the rotor, the electrical circuit switches one of the sets of magnets over, so that those in the rotor and stator find themselves repelling each other again. By doing this repeatedly at each cycle of the rotor, the rotor is kept constantly on the move. All this is done by the power of Magnetic force.
Explanation:
1. Compass
2. MRI scanners
3. Electric motor
4. Speaker
5. Refrigerator
6. Computer
7. Microwave
8. Cars
9. Trains
10. Fans
I hope it's helpful you