Magnetism Flashcards
What causes a material to be “magnetic”?
If a large percentage of atoms which it is comprised.
Suppose you have two bar magnets. One has the north and south poles marked, but the other one does not. Describe how you might use the first magnet to identify the poles on the unmarked magnet.
Then you will the magnet put the one part of the magnet next to the North Pole. If it repels then it is North, but if it abstracts then it is South.
What are magnetic domains?
They are cutters of aligned atoms.
How do magnetic domains respond to a strong magnetic field?
The magnetic domains align with the magnetic fields
Why can heating a magnet cause it to become less magnetic?
The heating could dieseling the atoms in the magnet.
What geographic direction does the north pole of a compass point?
North
Toward which pole of a bar magnet does the north pole of a compass point?
The South
If the Earth is a giant magnet, which pole of the magnet is located near the geographic north pole of the Earth?
The north pole
What is present in the space around a wire carrying current?
The magnetic field
Two wires located next to each other have current flowing in the same direction.
a. Will they feel an attractive force or a repulsive force?
b. Is this an electric force or a magnetic force?
a. Attractive force
b. Magnetic force
Describe how to make a strong electromagnet?
There are 3 ways:
- changing the number of coils of wire,
- changing the current in the wire,
- changing the material used for the core.
Magnetism results from?
The motion of electrically charged particles
Every spinning e-?
A tiny magnet
If e- pairs spin opposite directions?
They cancel
What element does not have a magnetic field?
Water
Magnetic poles
The ends of a magnet where the force is the greatest.
Magnetic force
The force between the poles of magnets
Magnetic field
Region around a magnet that exerts a force on magnetic materials. The space all around a magnet where the force of the magnet can act.
Magnetism
A class of phenomena in which a field of force is caused by the alignment of the magnetic moments of atoms in the same direction (domains) - ferromagnetism - or by a moving electric charge charge - electromagnetism.
Diamagnetism
The phenomenon caused by the orbital motion of electrons in the atoms of any material.
Paramagnetism
Due to the alignment of unpaired spins of lecterns in atoms of a material. All materials thus respond to some extent to a magnetic field, but only ferromagnetic materials show a readily apparent respond.
What would show the magnetic field of a magnet?
A magnetic field may can be seen when iron filings are sprinkled near a magnet. The iron filings form a pattern of lines. These lines are called lines of force. Lines of force show where the magnetic field is and what it looks like.
Explain the difference between the two poles of a magnet.
The ends of a magnet are called the poles. A magnetic field is strongest at the poles. A magnet has two poles - a north pole and a south pole. The poles are equal in strength.
The north pole of one magnet attracts the south pole of another magnet. The south pole of one magnet attracts the north pole of another magnet. But the north pole of one magnet repels, or pushes away, the north pole of another magnet. In the same way, the south pole of one magnet repels the south pole of a second magnet.
How is magnetism used to produce electricity?
Magnetism can be used to produce electricity. This can be done by moving a magnet through a coil of wire. Electricity is produces as long as the magnet moves through the coil. A generator produces electricity this way.
