Page 152 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

Magnetic flux density

It is the amount of flux passing through a defined area that is perpendicular to the direction of the flux:
Magnetic flux density = (magnetic flux) / (area)
B = Φ / A
The symbol of magnetic flux density is B.
The unit of magnetic flux density is the tesla (T)

1 T = 1Wb/m2
Magnetic fieild strength
The strength of magnetic field produced around a magnet is known as magnetic field strength. Field strength at
any point in a magnetic field, is numerically equal to the to the force experienced by an N pole of 1 Wb placed at
that point. It is denoted by the letter H. Magnetic field strength is also known as Magnetizing force or strength of
field or magnetic intensity or intensity of magnetic field.

Unit of field strength is N/Wb or AT/m or oersted.
Magnetic axis
The imaginary line joining the two poles of a magnet are called magnetic axis. It is also known as magnetic
equator.
Magnetic neutral axis
The imaginary line which are perpendicular to the magnetic axis and pass through the centre of the magnet are
called magnetic neutral axis.

139
CITS : Power - Electrician & Wireman - Lesson 26-29