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Bar Magnet Application
Bar magnet application
The magnetic field of a bar magnet
Illustrate the magnetic field surrounding a bar magnet with this interactive resource.
If you're on a mobile device, this resource is also available as an app!
Properties of Magnet: Types, Uses, Applications of Bar Magnet
Attraction is basic property of the magnets.
Magnet attracts metallic objects like iron & nickel. Repulsive and Directive are other properties of Magnet.
Fun With Magnets
Properties of Magnet: Types, Uses, Applications of Magnet
Attraction is the basic property of the magnets.
Magnet attracts metallic objects like iron , nickel, and cobalt.
But did you know metal is useful in generating electricity as well? What else can magnets do? What are the applications of magnets? Let us find out!
The Sticky Poles of Magnets
Make your own Magnet
List of Properties of Magnet: We already know that magnets are made up of the magnetic substance .
Magnets have certain important properties.
They are: Attractive Property – Magnet attracts ferromagnetic materials like iron, cobalt, and nickel.
Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other.
Directive Property – A freely suspended magnet always points in a north-south direction.
Magnets attract other magnetic substances.
This property can be demonstrated with the help of a simple activity.
Materials needed: A bar magnet , iron filings
Method: Place the bar magnet in the heap of iron filings.
Observation: Iron filings cling to the magnet.
Also, the maximum amount of iron filings cling at the two ends of the bar magnet.
These are the poles of the magnet.
Inference: The Magnetic property of poles is more than the rest of the magnet.
Poles of the magnet are those regions where the magnetic property is the maximum.
The two poles are different.
One pole of the magnet is the North pole and the other is the South Pole.
Every magnet whether big or small has the North Pole and the South Pole.
Browse more Topics under Fun With Magnets
Magnetic and Non-magnetic Materials
Repulsive Properties of Magnet
Like magnetic poles repel each other and unlike magnetic poles attract each other. Property of attraction and repulsion exists between two magnets.
It can be demonstrated with the help of a simple activity.
Materials needed: Two bar magnets
Method: Take two bar magnets.
Try to bring them close to each other in such a way that both the like poles come closer.
Now bring North pole of one magnet close to the south pole of another.
Observation: If the two poles you are trying to bring closer are the same ie.
Both are North poles or both are south poles, then the two poles will repel each other.
If you are trying to bring the opposite poles together there will be a force of attraction between the two magnets.
Inference: Like poles repel each other and unlike poles attract each other.
Directive Property of the Magnet
A freely suspended magnet always points in north-south direction This can be demonstrated with the help of a simple activity.
Materials needed: A bar magnet, a string, a stand
Method: Take a bar magnet.
Tie it with a string from the centre and hang it on the wooden stand in such a way that it can move freely.
Observation: The freely suspended magnet points in the north-south direction.
Explanation: Our planet earth also shows magnetism.
The Earth is actually a giant bar magnet with its magnetic north pole towards the Geographic South Pole and the magnetic South Pole towards the Geographic North Pole.
Hence, we can observe that north pole of a freely suspended magnet points toward the north pole of the earth and south pole of a freely suspended magnet points towards the South Pole of the earth .
Applications of Magnets
A magnet is used to separate the useful magnetic substance like steel and iron from waste by the method of magnetic separation.
This is done as follows.
An electromagnet is fitted to the long arm of the crane.
This is lowered over the heap of waste material and electromagnet is switched on.
The old iron and steel objects present in the heap of waste material gets attracted by the Electromagnet and stick to it.
The arm of the crane with iron and steel objects sticking to the Electromagnet is now lifted up and the crane is moved to another place.
Now the current is switched off.
The electromagnet loses its magnetism.
The waste is dropped and collected at a separate place.
Directive property of magnet is used to prepare magnetic compass.
Compass is an instrument which is used to find the directions.
Compass consist of a tiny magnetic needle which is pivoted from the center and is free to rotate.
The compass has a circular dial in which directions are marked.
The needle of the compass always points in the north-south direction .
It is used by soldiers in the Jungle and sailors in the sea to find directions.
Applications of magnets include various appliances like electric motor, doorbell, fan, washing machine, television, electric generator and various types of toys.
Magnets are used to hold objects like the doors of the refrigerator, pencil box lids, magnetic stickers etc.
Questions For You
Q1.Poles are not marked in a bar magnet.
How will you find out its poles?
Ans: To find out the poles, we will take another bar magnet with known poles.
We will bring one of the poles of the given magnet close to the north pole of the magnet.
If it attracts the pole is the south pole.
If it repels it is North pole.
Q2.You are provided with two identical metal bars.
One out of the two is a magnet.
Suggest two ways to identify the magnet.
Ans: Both are freely suspended.
One who will align in the north-south direction is a magnet, Bring a magnet close to both the metal bars and test with both the poles.
One who shows repulsion is a magnet.
YA Bar Magnet With Magnetic Dipole Moment Uis application
Question: Y A Bar Magnet With Magnetic Dipole Moment Uis Approaching A Wire Loop The North End Of The Magnet Ap- Proaches The Center Of The Loop.
A bar magnet with magnetic dipole moment is approaching a wire loop The north end of the magnet approaches the center of the loop with constant speed v.
The loop has a radius R and the symmetry axis of the loop is aligned with the axis of the bar magnet.
Answer the following questions at the instant the magnet is a distance L from the cen- 2 X 1 ter of the loop such that L >> R S Z C.
At the center of the loop, what is the direction of the change in the magnetic field? Briefly discuss how you determined this D.
What is the magnitude of the magnetic flux through the loop due to the bar magnet? You can ignore the variation in the magnetic field over the area of the loop (L >> R) E.
What is the direction of the conventional current I induced in the loop?
Assume the magnetic field does vary over the area of the loop.
Sketch arrows that represent the magnetic field of the bar magnet at locations 1 and 2 on the loop.
How does the magnitude of the bar magnet's magnetic field at location 1 compare to that at location 2? At other locations in the loop? Is there an expression that would let you calculate both the magnitude and direction of the magnetic field at any location in the loop?
Assume, at the instant shown, the magnitude of the bar magnet's magnetic field at location 1 is B and the current induced in the loop is I.
Write down an expression for the magnitude of the magnetic force on the loop due to the bar magnet I.
What is the magnitude of the magnetic force of the current loop ON the bar magnet?
The Magnet app is available in the Mac App Store for 99 cents.
With it, you can drag a window to the side or corner of your screen to have it occupy a half, third or quarter of your screen.
Drag a window to the side to choose half, the bottom edge for a third, and a corner for a quarter.
Drag it to the top edge to expand the window to take up your entire screen (but without entering full-screen mode where you lose the menu bar).
The magnet also features a menu bar icon that you can use to resize and reposition windows instead of dragging them to the edge of your screen, and in the app's preferences you can set up keyboard shortcuts for moving your windows.
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