Magnetism grade 8 technology electricity

11.5 degree bent not 15 degrees

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

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

Love your videos

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

No

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

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.

Thanks sir!

Is that any chemical liquid repels iron strongly.

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

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

Thank you very much sir.

where is the link to quiz

No