Unit 6 - Electrical and Electronic Principles (P7, P8, P9 and D2)
Unit 6 - Electrical and Electronic Principles (P7, P8, P9 and D2)
Unit 6 - Electrical and Electronic Principles (P7, P8, P9 and D2)
Unit 6 - Electrical and Electronic Principles (P7, P8, P9 and D2)
Unit 6 - Electrical and Electronic ...
Magnetism
In this part of the assessment, I will explain the characteristics of a magnetic
field(P7). I will also describe the relationship between flux density (B) and field
strength(P8). I will also talk about the principles and applications of electromagnetic
induction(P9).
P7
A magnet is an object which has its component atoms arranged in a certain way in
which it exhibits properties of magnetism such as attracting materials such as iron,
cobalt and nickel.
There are three main types of magnets:
Permanent magnets: Permanent magnet are objects that are magnetised and
continuously create its own magnetic field. Permanent magnets are the most
common as they can be found anywhere such as refrigerator magnets, inside
speakers etc.
Temporary magnets: As the name suggest temporary magnets are Temporary so
the object stays magnetised for a short period of time.
Electromagnets: Are objects that are wrapped in coils of wire and that act like
permanent magnets when electrical current passes through it but loses it magnetic
properties once the current is stopped.
A ferromagnetism refers to the material that can retain
their magnetic properties when the magnetic field is
removed. They behave like magnets while in the presence
of a magnetic field. Examples of ferromagnetic substance
are Iron, cobalt, nickel and more. Magnetism always
comes in a form of a dipole. A dipole is a pair of equal and
oppositely charged poles such as south and north or
positive and negative. A magnet always has 2 poles which
are north and south, where opposite attract and identical poles repel. This can be
seen in the first picture. If a magnet was to be cut in half, each of the
halves will have its own pair of north and south pair (dipole). This can
be clearly seen in the second picture. The force of attraction of a
magnet is greater at its poles than in the middle of the magnet as the
line of flux are more closely spaced together.. When two identical
poles repel each other they create a neutral point where the magnetic
field strength is 0. This can be seen in the picture below where the x represents the
neutral point
A magnetic field is the region around
the magnet where the force of
Riversan Thapa
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