Q1 Name the device where following shapes of magnets are used.
a) Horse shoe magnet
b) Magnetic needle
c) Circular magnet
Q2. Knowing Magnet
a) Magnet was first discovered in
b) First known magnetic material is
c) Directive property of magnet was first discovered in
d) Magnets can be of two types
Q3. What happens if a freely suspended magnet is disturbed and its ends put towards
east-West direction?
Q4. How do magnets get demagnetized?
Q5- Where are two poles of a magnet located?
Q6. How is a compass used to find directions?
Q7. State the principle on which compass is based.
Q8. Differentiate between natural and artificial magnet.
Pls answer the first one who ans will be marked as brainliest
Answers
Answer:
1.(a)it can be used to pick up metal objects of any size depending on the strength of the horseshoe magnet. For example, small horseshoes can collect paper clips while industrial-sized horseshoe magnets are used in construction and engineering to pick up large pieces of heavy metal. Horseshoe magnets are also used at the bottom of pendulums.
(b) magnetic needle - a slender magnet suspended in a magnetic compass on a mounting with little friction; used to indicate the direction of the earth's magnetic pole magnet - (physics) a device that attracts iron and produces a magnetic field magnetic compass - compass based on an indicator (as a magnetic needle) that points to the magnetic north
(c)It's suggested that this circular magnet arrangement may be to do with wireless charging. The new "iPhone 12," or its case, might support charging other devices, in which case these magnets may keep those in place. Alternatively, the magnets may be there to help with the charging of the phone itself.
2. (a) The first scientist to actually make a magnet was actually a physician—Britain’s William Gilbert. In 1600 he discovered not only that the Earth itself was a magnet, but also that magnets could be forged out of iron and that their magnetic properties could be lost when that iron was heated.
(b) Iron was first used as a magnetic material in the 19th century, after the discovery of the laws of electromagnetism by H. C. Oersted, M. Faraday, and H. F. E. Lenz and after the invention of direct-current machinery by B. S. lakobi, of a transformer and an alternating-current generator by P. N. lablochkin, and of a three-phase current by M. O. Dolivo-Dobrovol’skii.
(c)Types of Magnets
There are three types of magnets, and they are as follows:
Permanent magnet
Temporary magnet
Electromagnets
Ceramic or ferrite
Alnico
Samarium Cobalt (SmCo)
Neodymium Iron Boron (NIB)
Temporary Magnet
Temporary magnets can be magnetized in the presence of a magnetic field. When the magnetic field is removed, these materials lose their magnetic property. Iron nails and paper-clips are examples of the temporary magnet.
Electromagnets
Electromagnets consist of a coil of wire wrapped around the metal core made from iron. When this material is exposed to an electric current, the magnetic field is generated making the material behave like a magnet. The strength of the magnetic field can be controlled by controlling the electric current.
Related Articles:
Difference Between Electromagnet and Permanent Magnet
Bar Magnet
Magnetic Classification of Materials
Characteristics of Magnet
Following are the characteristics of magnet:
Attractive property: This property proves that the magnetic strength at the ends of the poles is strong.
Directive property: This property helps to understand which pole of the magnet is north and south by suspending the magnet in mid-air.
Law of magnetic poles: Like poles repel while unlike poles attract.
Pair property: When a magnet is cut into two pieces, both the pieces will have the North Pole and the South Pole.
Sure test of magnetization: This test is conducted to check if a given rod is magnetized or not by checking either the attraction or the repulsion of the iron rod and magnet.
Uses of Magnets
Following are the uses of magnets:
Magnets
Permanent
Electromagnets
Magnets are used for the separation of iron filling from other solid mixture
3.The freely suspended magnet comes to rest at south and north direction
4. Change the Magnet with High Heat. Heating a magnet causes the electrons inside to spin and generally move to higher energy states, which makes them end up in a position ...
Place the Magnet in a Reverse Field. You can also remove the magnetic property of a magnet by placing it in a reversed magnetizing field.
Hammer the Magnet. If you hit the magnet in such a way as to destroy its north and south pole alignment, it will often lose its magnetic properties
5. The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole. If you line up two magnets so that the south pole of one faces the north pole of the other, the magnets will pull toward each other. This is called attraction
6. Basic Compass Reading
Hold your compass steadily in your hand so the baseplate is level and the direction-of-travel arrow is pointing straight away from you.
Hold it about halfway between your face and waist in a comfortable arm position with your elbow bent and compass held close to your stomache.
8. Artificial magnets are made by man by using different techniques. Natural magnets are found in nature. They are stronger as compared to natural magnets. They are weaker as compared to artificial magnets. They are available in different shapes and sizes