# How can the magnetic field around a permanent magnet be determined?

Magnetic fields can be mapped out using small plotting compasses : Place the plotting compass near the magnet on a piece of paper. Mark the direction the compass needle points. Move the plotting compass to many different positions in the magnetic field, marking the needle direction each time.

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## How is the magnetic field determined?

A magnetic field line is the path along which a free north-pole tends to move. The direction of a magnetic field at a point is determined by placing a small compass needle. The N – pole of compass indicates the direction of magnetic field at that point.

## Is magnetic field a permanent magnet?

Modern theories of magnetism maintain that a magnetic field is produced by an electric charge in motion, and thus it is theorized that the magnetic field of a so-called “permanent” magnets such as lodestone is the result of electrons within the atoms of iron spinning uniformly in the same direction.

## How will you describe the magnetic field around a current carrying coil?

The magnetic field around a current carrying coil is produced due to the current flowing through it. It is uniform throughout. It is just like the magnetic field of a bar magnet. If needles of a magnetic compass are arranged around the coil, they will arrange themselves in North to South direction.

## How do you find the magnetic field of a permanent magnet?

And here the second key feature enters; the magnetic field of permanent magnets can be calculated from the equivalent surface current density I = dI/ds = Br/µ0 that is proportional to the remanent magnetic field Br of the permanent magnet material. Here µ0 = 4π × 10−7 A/Tm is the permeability of free space.

## How is magnetic field around an object represented?

Electric Current and Magnetic Fields

This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. One way to explore the direction of a magnetic field is with a compass, as shown by a long straight current-carrying wire in. Hall probes can determine the magnitude of the field.

## What is the magnetic field strength of a permanent magnet?

The magnetic field strength of (permanent) magnets is expressed in terms of magnetic induction B (so in Tesla) rather than of H. For instance the Earth’s magnetic field strength is about 60 μT, and the strengths of permanent magnets range from 0.01 to 1 T.

## Where is the magnetic field around a magnet the strongest?

It is strongest at the poles. So, what are magnetic poles? Magnetic poles are opposite ends of a magnet where the magnetic field is strongest.

## How does a magnetic field around a bar magnet different from that on Earth?

The average magnetic field strength in the Earth’s outer core was measured to be 25 Gauss, 50 times stronger than the magnetic field at the surface. The field is similar to that of a bar magnet. The Earth’s magnetic field is mostly caused by electric currents in the liquid outer core.

## How can the direction of a magnetic field be reversed?

The direction of the induced voltage is reversed when the magnet is moved out of the coil again. It can also be reversed if the other pole of the magnet is moved into the coil. If the coil is part of a complete circuit then a current will be induced in the circuit.

## How permanent is a permanent magnet?

Industrial magnets are incredibly durable and reliable. In fact, when used correctly and with proper care, they should lose less than 1% of their strength over the course of 100 years!

## Why are permanent magnets permanent?

A permanent magnet is called a permanent magnet because its magnetism is ‘always on’, it generates its own persistent magnetic field unlike an electromagnet which is made from a coil of wire wrapped around a ferrous core and requires an electric current to generate a magnetic field.

## Does magnetic field have direction?

The magnetic field does not point along the direction of the source of the field; instead, it points in a perpendicular direction. In addition, the magnetic force acts in a direction that is perpendicular to the direction of the field.

## What makes a permanent magnet?

Permanent magnets are made from “hard” ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture to align their internal microcrystalline structure, making them very hard to demagnetize.

## How are magnetic field lines surrounding a magnet conventionally drawn?

not at all. Magnetic field lines surrounding a magnet are conventionally drawn? from north to south.

## What is magnetic field and magnetic field lines?

The magnetic field is an abstract entity that describes the influence of magnetic forces in a region. Magnetic field lines are a visual tool used to represent magnetic fields. They describe the direction of the magnetic force on a north monopole at any given position.

## How will you relate the strength of magnetic field with the distance between magnetic field lines?

By convention, the lines trace the force from the north to south pole of a magnet. The distance between the lines indicates relative strength of the magnetic field. The closer the lines are, the stronger the magnetic field is.

## What are magnetic field lines explain why magnetic field lines are closed curves the given magnet is divided into three parts a B and C as?

Reason: A and C are magnetic poles and have maximum number of magnetic field lines which determine the intensity of magnetic field while B is centre of the magnet has no magnetic field lines. So intensity of magnetic field near B is almost zero.

## Why are magnetic field lines closed curves?

Magnetic field lines are closed curves because it starts from the north pole and terminates at the south pole of the magnet. Was this answer helpful?

## How do you trace the magnetic field lines around a bar magnet using compass needle explain write the properties of magnetic field lines?

1. place the plotting compass near the magnet on a piece of paper.
2. mark the direction the compass needle points.
3. move the plotting compass to many different positions in the magnetic field, marking the needle direction each time.
4. join the points to show the field lines.

## Why is the magnetic field stronger closer to the magnet?

the magnetic field lines never cross each other. the closer the lines, the stronger the magnetic field (so the magnetic field from a bar magnet is strongest closest to the poles)

## How will you determine which region of the magnetic field is stronger than other regions?

The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.

## Why the magnetic field is stronger at the pole?

The closer the magnetic field lines are, the stronger the magnetic field at that point. As we can see in the diagram, the magnetic field lines are closer or denser at the poles. So, the magnetic field is strongest around the poles of the magnet.

## What is the magnetic field around a bar magnet?

A magnetic field is the region around a magnet where a force acts on another magnet or on a magnetic material. Magnetic fields lines are invisible but they fill the space around a magnet where the magnetic forces work on magnetic materials, and where they can attract or repel other magnets.

## What does a magnetic field around a magnet look like?

The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet. Permanent magnets can be made from ferromagnetic materials.

## What happens to the direction of the magnetic field if the current is reversed?

Answer: The magnetic field generated is always perpendicular to the direction of the current and parallel to the solonoid. Hence if we reverse the current the direction of magnetism also reverses. In other words the magnetic poles gets reversed (North pole becomes south pole and the south pole becomes the north pole).

## How can force be reversed?

If the forefinger points in the direction of the magnetic field and the middle finger in the direction of the current, then, the thumb points in the direction of the force exerted on the conductor.So, if the current is reversed in the conductor placed in a magnetic field the direction of force is also reversed.

## How do you determine the direction of the magnetic field in the right hand rule?

The right hand rule states that: to determine the direction of the magnetic force on a positive moving charge, point your right thumb in the direction of the velocity (v), your index finger in the direction of the magnetic field (B), and your middle finger will point in the direction of the the resulting magnetic force …

## What is magnetic field of a bar magnet?

The space where the magnetic force of the magnet acts is called a ‘magnetic field. ‘ The direction of the magnetic field is determined in the direction indicated by the N pole of the magnetic needle placed at that point.

## How can magnetic field reverse Class 10?

The direction of magnetic field gets reversed in case of a change in the direction of electric current. Let a current carrying conductor be suspended vertically and the electric current is flowing from south to north. In this case, the direction of magnetic field will be anticlockwise.

## What is a permanent magnetic field?

A permanent magnet is often made from a magnetic material such as steel. A permanent magnet always causes a force on other magnets, or on magnetic materials. Key features of a permanent magnet: it produces its own magnetic field. the magnetic field cannot be turned on and off – it is there all the time.

## Do permanent magnets last forever?

So how long should my permanent magnet last? Your permanent magnet should lose no more than 1% of its magnetic strength over a period of 100 years provided it is specified and cared for properly. There are a few things that may cause your magnet to lose its strength: HEAT.

## What makes permanent magnet and electromagnet difference?

The magnetic field and strength are the main differences between permanent magnets and electromagnets. A wire-wound coil creates the magnetic field in an Electromagnet, whereas the magnetic field of a Permanent (Bar) Magnet cannot be altered.

## What do permanent magnets always have around it?

Permanent magnets

A permanent magnet always causes a force on other magnets, or on magnetic materials. Key features of a permanent magnet: it produces its own magnetic field. the magnetic field cannot be turned on and off – it is there all the time.

## What causes magnetic field in magnet?

All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.

## Which is true about magnetic field lines?

Field lines outside a magnet originates from North pole and ends at South pole. The field lines intersect each other. The field lines form closed loops. They originate outside the magnet from South pole and ends at North pole.

## Which direction is magnetic field conventionally drawn?

So conventionally we take the direction of the magnetic field lines outside the magnet from not to south direction. And since magnetic field lines they form a closed loop, so inside the magnet the direction will be from south to north.

## What is magnetic field field?

magnetic field, a vector field in the neighbourhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable.

## How are magnetic field lines drawn?

Figure 20.11 Magnetic field lines can be drawn by moving a small compass from point to point around a magnet. At each point, draw a short line in the direction of the compass needle. Joining the points together reveals the path of the magnetic field lines.

## Is magnetic field and magnetic field lines are same?

What is the difference between magnetic field and magnetic field lines? A magnetic field is represented by a series of lines around a magnet. The path along which north pole moves in a magnetic field is called magnetic lines of force or magnetic field line.

## Why does magnetic field strength decrease with distance?

If the distance between two magnets with like poles gets smaller, then the repelling force between them will get bigger, because the force between two magnets gets stronger as they get closer together, and weaker as they get farther apart.

## Why is magnetic field strength inversely proportional to distance?

And it is found that the magnetic field lines at points near the wire are more and lie closer to each other while at points far away from the wire the magnetic field lines are lesser.

## How is magnetic field around an object represented?

Electric Current and Magnetic Fields

This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. One way to explore the direction of a magnetic field is with a compass, as shown by a long straight current-carrying wire in. Hall probes can determine the magnitude of the field.

## Why no two field lines are found to cross each other?

Two magnetic field lines do not intersect each other because if there was point of intersection, The compass needle would point towards 2 directions. Which means that the magnetic field has two different directions, which is not possible.

## Where the magnetic field is maximum and minimum?

(i) The magnetic field of a current element is minimum (which is zero) along the axis of a current element. (ii) The magnetic field of a current element is maximum in a plane passing through the element and perpendicular to its axis.

## Which of the following statement is not correct about the magnetic field?

Outside the magnet, magnetic field lines go from south to north pole of the magnet is not the correct statement regarding magnetic field. Explanation: The two magnetic field lines never intersect each other.

## What is the shape of magnetic field lines around carrying straight conductor?

They are concentric circles.

## What is the name of the space around a magnet?

A magnetic field is the area around a magnet, magnetic object, or an electric charge in which magnetic force is exerted.” Huh? Let’s put it this way. The invisible area around a magnetic object that can pull another magnetic object toward it or push another magnetic object away from it is called a magnetic field.

## Why magnetic field lines are closed and continuous curves?

Magnetic field lines are closed curve because for a magnet there are no monopoles i.e., a magnet always has two poles (north pole and south pole) even if it is cut from anywhere between.

## Why direction of magnetic field lines is from north to south?

The direction of magnetic field lines outside a magnet is from the North Pole to the South Pole. So option 3 is correct. This is because the North and South Pole of a magnet attract each other due to the position and motion of electric charges.

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