How can the direction of the magnetic field be reversed?
The direction of the current must be reversed every half turn, otherwise the coil comes to a halt again. This is achieved using a conducting ring split in two, called a split ring or commutator. A coil of wire is used with lots of turns to increase the effect of the magnetic field.
Where do manufacturers use a magnetic strip in the refrigerator Why is the magnetic strip used?
Answer. Explanation: A magnetic strip is used at the borders of the doors of the refridgerator so that the doors get closed properly. A magnetic strip is used at the borders of the doors of the refridgerator so that the doors get closed properly.
What produces magnetism in the human body?
The heart and the brain are well known as organs that generate ion cur- rents. The current from the heart mus- cle, when measured with electrodes on the skin, produces the electrocardio- gram (ECG); the same current produces a magnetic field around the torso which, when measured, is called a magnetocar- diogram (MCG).
Where is magnet used in your refrigerator?
Most refrigerators have sheet steel doors and the magnetic field lines pass through the door metal from the north poles of the sheet magnet to the south poles, making the magnet stick to the refrigerator door.
What kind of magnet is used to attach a picture to a refrigerator?
Ferrite magnets are commonly used, too, with decorative elements attached to the magnets with adhesive.
Is a refrigerator door a permanent magnet?
Similarly, refrigerator magnets are made of a material that is permanently magnetized – they don’t use an electric current to generate a magnetic field.
Why does a magnet stick to a refrigerator door?
The magnetic field created by 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 keeps the magnet stuck to the fridge.
How do magnets hold the paper on the refrigerator door?
How does the magnet stick without touching the door? Atoms from the magnet pass through the paper and touch the door. Gravity attracts the magnet to the door.
Are the sides of fridges magnetic?
Put magnets on the side of the refrigerator. Many refrigerators use a different material, often black in color, on the sides, and the sides are often magnetic. If you have one side of your refrigerator that shows in your kitchen, perhaps beside the cabinets, hang your magnets there instead of on the front.