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Electrotechnology 4

Make me proud

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monenephaswane2
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30 views1 page

Electrotechnology 4

Make me proud

Uploaded by

monenephaswane2
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Individual

Activity 1.2
excited or energised?
What happens when a coil of wire is
1. coil.
2. State the right-hand rule.
strength of the magnetic field around a
3. List four ways to increase the

Unit 1.3: Magnetic flux density


magnetic
lines of flux

permanent
magnet

N S

specific area

Figure 1.6: Magnetic fiux density


is referred to as
The amountof magnetic flux () passing through a specific area is
magnetic flux
density: he
magnetic flux density. Magnetic flux density is represented by symbol Band
amount of
measured in tesla (T).
magnetic flux
B
passing through
a specifiC area
Where:
B = magnetic flux density in teslas (T)
= magnetic flux inwebers (Wb)
a= specific area in m'

Example 1.1
The magnetic flux density in the gap between twomagnetic poles is 0,5 teslas. For an
air-gap area of 575 mm', calculate the total magnetic fiux.
Solution
Given: B= 0,5 T; a= 575 x 10- m²
B= a

=Ba
= (0,5)\575 x 10-9)
=2,875 x 10-4 Wb

Force exerted on a current-carrying conductor placed inside


a magnetic field
1 Place two bar magnets next to each other. Remember that around each
magnet there is a magnetic field. We will, however, focus only on the
magnetic lines of flux spread over the area shown in Figure 1.7a.
4

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