Magnetism grade 8 technology electricity

by adminDianeAshleyBooks



Magnetism: Let’s learn about magnets! A magnet has 2 poles: North pole and South pole. Magnets have a special property to attract materials such as iron, steel, nickel and cobalt. Magnets can be of different shapes: bar magnet, horse shoe magnet. We also look at a magnetic compass and the Earth’s magnetic field. Android App: Our Website: Special Offer on our Full Courses! CBSE Class 10 Courses: CBSE Class 9 Courses: CBSE Class 8 Courses: ICSE Class 10 Courses: ICSE Class 9 Courses: ICSE Class 8 Courses: IGCSE Courses: Python Coding: Java Coding: Facebook page: At Manocha Academy, learning Science and Math is Easy! The school coursework is explained with simple examples that you experience every day! Yes, Science & Math is all around you! Let’s learn every day from everyday life!

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31 comments

Meera Neharkar 03/03/2022 - 5:59 Chiều

Kya aap please hindi me samjhaiye na

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Acoustic Brother 03/03/2022 - 5:59 Chiều

11.5 degree bent not 15 degrees

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nneamaka queendaline 03/03/2022 - 5:59 Chiều

Sire please show us calculations on magnetism

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Prashant Sharma 03/03/2022 - 5:59 Chiều

@ TheBest only 24 karat gold can get attracted to magnet because it is pure gold. less than 24 karat will not attract

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TheBest 03/03/2022 - 5:59 Chiều

sri kya gold attract hota ha kya

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HarisseHealthTipzz 03/03/2022 - 5:59 Chiều

i literally stopped the video to go and try bringing two ear pieces together
MAGIC

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Epic Members 03/03/2022 - 5:59 Chiều

clear explanation

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Jai Maloth 03/03/2022 - 5:59 Chiều

Love your videos

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Bajgain Maya 03/03/2022 - 5:59 Chiều

Thank you so much sir

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madhushree sl 03/03/2022 - 5:59 Chiều

Sir i love ur video's ! Thanq! U are the best Physics Teacher i have ever seen! By the way wats ur name sir?

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Sukai Jallow 03/03/2022 - 5:59 Chiều

I really find your teaching very attractive and interesting… and I also had a question to ask under magnetism, the read why when magnet are placed near a television it get a black patch on its screen

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MUHAMMAD OWAIS 03/03/2022 - 5:59 Chiều

No

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HARSH GAMERLAZA 03/03/2022 - 5:59 Chiều

Megnetic field line on disc magnet tell please?

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Queengul 14 03/03/2022 - 5:59 Chiều

Oh God I never thought that physics would be that easy if we get a teacher like manocha…….

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Divya Chandrasekaran 03/03/2022 - 5:59 Chiều

yeah i heard of magnets before i know that

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shelly agarwal 03/03/2022 - 5:59 Chiều

Magnetism:It the force of attraction or repulsion that act at a distance because of presence of magnetic field.Magnetic field is caused or generated bymoving electrically charged particles or it is inherent in magnetic objects such as magnet.Magnets:•A magnet has two ends termed as poles. North Poleand South Pole.•Like poles repel, Opposite poles attracts •Every magnet creates invisible area around it , called as Magnetic field •Earth itself act as giant magnet, North pole of magnet indicates north pole of earth•If you cut the bar magnet at center , you get another two bar magnets•Magnetization can be brings about in non-magnetic material such as iron nail by simply running a magnet over it. Magnetic Field:Themagnetic fieldisnothing but imaginary area around amagnetin which there ismagneticforce.It is invisible magnetic fieldthatdescribes the magnetic influencethat extends all around them.Electromagnet:Electromagnet are those temporary magnets in which , the strength of their magnetic field can easily be controlled just by changing the amount of electric current that flows through it.Laws of Magnetism:1.Like poles repel each other whereas unlike pole attracts each other2.Poles are opposite to each other but equal in magnitude or strength 3.Poles are inseparable, means on cutting of bar magnet new magnets are formed with new poles.4.Long bar magnet can retained magnetism longer than short bar magnets due to the less demagnetizing action of poles. (Horse-shoe magnet retained more than bar magnet)5.On Magnet demagnetization as well as remagnetization canbe performed.

Application of magnets and electromagnets:•Electromagnets are used in numerous of electrical devices such as electrical bell, telephone, radio, transistor, loudspeaker etc.•It is also used in fan, motor, mixers as well as room cooler.•Used in compass needle •Common use big electromagnets are used for removing iron objects from scrap.The branch of physics which deals with the relationship between electricity and magnetism termed as “Electromagnetism”Electrical bell :It is made of an electromagnetand work on its application where there is presence of bell(metal shapedcup like structure), soft iron strip which act as a hammerand contact screw. The shape of device is somewhat cup-shaped, ultimately made up of metal.A soft iron strip works as a small hammer.Working :•Whenever the switched is on then the current is passed through the circuit and the electromagnet acts like a temporary magnet and start attracting the iron strip. •The iron strip that is hammer, which is elastic in nature, strikes the bell. •At the same moment, its contact with the screw is lost , which turn out to be the breaking of circuit and the current stops flowing through the electromagnet. •In fraction of seconds of interval, the iron strip returns to its original position, and quickly the current passes through the electromagnet.This repeated process happens many times in a second, and as the hammer strikes the bell, the sound is heard clearly.The bell rings till thecircuit has been switched off temporarily.The electric bell is used in alarms and bells is schools, offices, homes and industries.Electrical current:It is defined as the amount of charge flowing per second through a cross sectional part of conductor.SI unit is Ampere (A).In a conductor the passage of electric current is only due to the flow of electrons as atoms sticks to their position.

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Grace Anku 03/03/2022 - 5:59 Chiều

Thanks a lot

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Anish 03/03/2022 - 5:59 Chiều

Thanks sir!

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Mind Blowing Experiments 03/03/2022 - 5:59 Chiều

too much crystal clear
best teacher in the world i have ever seen

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Pugazh Sw 03/03/2022 - 5:59 Chiều

Is that any chemical liquid repels iron strongly.

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Pugazh Sw 03/03/2022 - 5:59 Chiều

For example: I have a copper coin or copper metal. While iron will come to copper metal always it must be repels. What is the function to do with that copper metals

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Pugazh Sw 03/03/2022 - 5:59 Chiều

What to do if iron always repels magnets. Is that any ideas sir.

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Pugazh Sw 03/03/2022 - 5:59 Chiều

If iron and magnets have repels always means what is the procedure sir

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Ta#Keep smilling R# 03/03/2022 - 5:59 Chiều

My best best video of book full intro is just in this 18 min video truly see it .

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Muhammad Umar 03/03/2022 - 5:59 Chiều

Sir why monopole not exist???

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krish nadar 03/03/2022 - 5:59 Chiều

Thank you very much sir.

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Suman Gupta 03/03/2022 - 5:59 Chiều

Thank for guidance

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Mehroz Afrain 03/03/2022 - 5:59 Chiều

where is the link to quiz

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MR-ToXiC 03/03/2022 - 5:59 Chiều

Good
Ishan

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jitendra kumar 03/03/2022 - 5:59 Chiều

No

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Paddu Venna 03/03/2022 - 5:59 Chiều

Just a suggestion. If 10 class is one of the tags then please remove it. This really wasted all my time. I thought this explained electromagnets and mainly how motor works and stuff. Yeah my bad.

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