Table of Contents
- 1 How do you find the magnetic field pattern of a permanent magnet?
- 2 How is the magnetic field determined?
- 3 Why is there a magnetic field pattern around the magnetic material?
- 4 Why are permanent magnets permanent?
- 5 How is the direction of a magnetic field determined simple?
- 6 What is magnetic field and field lines?
How do you find the magnetic field pattern of a permanent magnet?
You can use a plotting compass or iron filings to detect a magnetic field:
- put a piece of paper over a magnet (this stops the iron filings sticking to the magnet)
- sprinkle iron filings onto the paper.
- gently tap the paper to spread the filings out.
- observe and record the results.
How does a permanent magnet have a magnetic field?
Field lines of a permanent magnet go from north to south. Permanent magnets are materials where the magnetic field is generated by the internal structure of the material itself. So the magnetic fields of permanent magnets are the sums of the nuclear spins, the electron spins and the orbits of the electrons themselves.
How is the magnetic field determined?
(a) 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.
How do you test for a permanent magnet?
A permanent magnet causes repulsion with one pole when the poles are brought in turn near a suspended magnet. An unmagnetised magnet material would be attracted to both poles.
Why is there a magnetic field pattern around the magnetic material?
Magnets create magnetic fields. These magnetic fields cannot be seen. They fill the space around a magnet where the magnetic forces work, and where they can attract or repel magnetic materials.
What makes a permanent magnet permanent?
The main way that permanent magnets are created is by heating a ferromagnetic material to a key high temperature. The temperature is specific to each kind of metal but it has the effect of aligning and “fixing” the domains of the magnet in a permanent position.
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.
Where is the magnetic field around a magnet the strongest?
poles
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 is the direction of a magnetic field determined simple?
It states that, to determine the direction of the magnetic force on a positive moving charge, you point the thumb of the right hand in the direction of v , the fingers in the direction of B , and a perpendicular to the palm points in the direction of F .
What is a permanent magnetic field?
A permanent magnet is often made from a magnetic material such as iron. 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 is magnetic field and 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.