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hello and welcome to this video tutorial
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on magnetic effects of electric current
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for class 10 physics in this video I
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will talk about magnetism and magnets I
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have provided links to relevant study
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material in the description box so do
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check them out if you are new to our
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Channel please subscribe and press the
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bell icon for latest updates now the
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name of the chapter suggests that
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electric current produces magnetic
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effects this indicates that there is a
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relationship between electricity and
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this relationship between electricity
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and magnetism has been established by
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the works of scientists like Hans
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Christian ørsted Michael Faraday and
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Andre ampere before going into how both
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electricity and magnetism are related
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let us first talk about magnetism
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so what is magnetism magnetism has been
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a source of a curiosity for ages
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magnetism is the property due to which a
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substance attracts pieces of iron nickel
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and cobalt to words itself
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we can find magnets in science lab toys
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and in magnetic stickers which we often
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stick to the refrigerators and steel
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Almaraz the earth itself acts as a
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let us talk about magnets so what is a
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magnet magnets are the substances which
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have the property of attracting small
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pieces of iron nickel and cobalt and
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this property of attraction as we stated
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earlier is called magnetism most of the
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metals of common use like copper gold
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silver aluminum etc are not attracted to
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the magnets magnets are found naturally
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in certain natural rocks and can also be
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made artificially natural magnets
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contain a magnetic compound called
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that is fe3o4 we can also make magnets
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artificially from alloys of iron nickel
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and cobalt so that they retain their
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magnetism for long amount of time such
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magnets are called permanent magnets
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artificially made permanent magnets are
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made in various shapes like bar rod disk
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ring etc as shown in this figure in a
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bar rod and horseshoe magnets north and
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south pole are indicated by letters n
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and s or sometime North Pole is
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indicated by a dot in disk and ring
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magnets one faces North Pole and another
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faces South Pole magnetism has many uses
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permanent magnets are used in Direction
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finding compass magnets are used in
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making magnetic stickers a well-known
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medical diagnostic procedure known as
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magnetic resonance imaging or MRI uses
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magnetism of protons inside human body
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to form images of tissues
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while learning about magnets and
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magnetism we came across a term called
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magnetic poles so what are magnetic
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magnetic poles refers to two areas of
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magnet where the magnetic effect are the
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strongest the poles are generally termed
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as North Pole and South Pole
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magnetic poles exert force on each other
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as can be seen in this figure like poles
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so if we have two magnets and we try to
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bring it to North Pole together then one
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North Pole will repel another North Pole
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similarly if you try to bring two South
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Poles of two different magnets together
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then South Pole of one magnet will
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ripple South Pole of another magnet
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unlike poles attract each other so South
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Pole of one magnet will attract North
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Pole of another magnet
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similarly North Pole of one magnet will
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attract South Pole of another magnet we
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will now conclude this video by summing
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up the properties of the magnets
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first property is magnets attract
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objects that are made up of iron and
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cobalt and nickel magnets do not attract
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objects that are made up of copper
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second property of the magnets is that
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force of attraction or repulsion of a
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magnet is greater at its poles then in
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the middle we have also learned that
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like poles of the magnets repel each
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other while unlike poles of magnets
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you must know this property from
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experience that a free suspended magnet
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always points towards north and south
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this happens because earth behaves as a
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huge bar magnet this figure shows the
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South and North Pole of the earth magnet
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let us place a compass and Earth's
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magnetic field only this means we do not
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have the influence of other magnets on
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the compass as can be seen from this
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figure that compass and Earth's magnetic
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field points in north and south
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directions here from field lines at
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other points we can see that North Pole
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of compass always points towards the
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South Pole of Earth's magnet again from
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this figure we can see that South Pole
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of the Earth's magnet is in the
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geographical north because it attracts
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the North Pole of the suspended magnet
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and the North Pole of Earth's magnet is
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geographical South because it attracts
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the south pole of the suspended magnet
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so we can conclude that there is a
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magnetic s pole near the geographical
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north and there is a magnetic n pole
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near the geographical south the pole of
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a magnet which points towards the north
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direction is called North Pole or not
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seeking end and the pole of a magnet
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which points towards the south direction
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is called south pole or south seeking
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end so in this video you learned about
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magnetism magnets and properties of
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our next video would be about magnetic
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fields for latest updates please
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subscribe to our Channel and stay tuned
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do check the relevant links given below
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in the description box thank you
