Magnets have two poles; the field lines spread out from the north pole and circle back around to the south pole. In this activity, you’ll watch field lines materialize before your very eyes. The invisible will be made visible thanks to a handful of tiny iron filings.
How do you find the magnetic field of a line?
Detecting magnetic fields
- 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.
- join the points to show the field lines.
What causes magnetic field lines?
Magnetic field due to moving charges and electric currents
Magnetic field lines form in concentric circles around a cylindrical current-carrying conductor, such as a length of wire. The direction of such a magnetic field can be determined by using the “right-hand grip rule” (see figure at right).
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. … When opposite poles of two magnets are brought together, the magnetic field lines join together and become denser between the poles.
What are the 4 magnetic materials?
Magnetically hard materials are used to create permanent magnets made from alloys generally consisting of varying amounts of iron, aluminium, nickel, cobalt and rare earth elements samarium, dysprosium and neodymium.
Why can’t magnetic field lines cross?
Magnetic field lines can never cross, meaning that the field is unique at any point in space. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole.
What is the purpose of a magnetic field?
Magnetic fields force moving electrically charged particles in a circular or helical path. This force—exerted on electric currents in wires in a magnetic field—underlies the operation of electric motors. (For more information about magnetic fields, see magnetism. The use of magnetic fields to generate electric current.
What is magnetic field in simple words?
The magnetic field is the area around a magnet in which there is magnetic force. Moving electric charges can make magnetic fields. … In physics, the magnetic field is a field that passes through space and which makes a magnetic force move electric charges and magnetic dipoles.
Where is a magnetic field the strongest?
the closer the lines, the stronger the magnetic field (so the magnetic field from a bar magnet is strongest closest to the poles) the lines have arrowheads to show the direction of the force exerted by a magnetic north pole.
Which is stronger of the two electric field or magnetic field?
The way in which charges and currents interact with the electromagnetic field is described by Maxwell’s equations and the Lorentz force law. The force created by the electric field is much stronger than the force created by the magnetic field.
Can we use the Earth’s magnetic field to generate electricity?
Earth’s magnetic field is very weak, so you would get very little current from your generator. … They have magnetic fields around 6,000 times stronger than Earth’s magnetic field. Magnetic fields inside electrical generators are similar to this.19 мая 2019 г.
Why do magnetic lines of force move from north to south?
When it comes to magnets, opposites attract. This fact means that the north end of a magnet in a compass is attracted to the south magnetic pole, which lies close to the geographic north pole. Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole.
What are the 3 magnetic materials?
Magnetic metals include:
- Some alloys of rare earth metals.
Can you pick up gold with a magnet?
Pure gold is not attracted to magnetic fields, but if an enormous magnetic field is applied to gold, the gold will slightly move and then slightly repel it. However, this is only so slightly and so no, it cannot be found with magnets.
What is the most powerful magnetic material?