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Applied Mathematics for Electrical Engineering  3130908
Complex Variables and Partial Differential Equations  3130005
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Basic Electrical Engineering  3110005
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Compiler Design  2170701
Data Mining And Business Intelligence  2170715
Information And Network Security  2170709
Mobile Computing And Wireless Communication  2170710
Theory Of Computation  2160704
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Basic Electrical Engineering
(3110005)
BEE3110005
Winter2019
Question5b
BE  Semester
1
Winter2019

11012020
Q5) (b)
4 Marks
Explain the terms :  1. Residual magnetism 2. Coercive Force.
Hysteresis of a magnetic material is a property by virtue of which the flux density (B) of this material lags behind the magnetizing force (H).
Hysteresis loop is a four quadrant B – H graph from where the hysteresis loss, coercive force and retentively of magnetic material are obtained.
To understand hysteresis loop, we suppose to take a magnetic material to use as a core around which insulated wire is wound.
The coil is connected to the supply (DC) through variable resistor to vary the current I, as the current I is directly proportional to the value of magnetizing force (H).
When supply current I = 0, so no existence of flux density (B) and magnetizing force (H). The corresponding point is o in the graph beside.
When current is increased from zero value to a certain value, magnetizing force and flux density both are set up and increased following the path o to a.
For a certain value of current, flux density becomes maximum (Bm). The point indicates the magnetic saturation or maximum flux density of this core material.
When the value of current is decreased from its value of magnetic flux saturation, H is decreased along with decrement of B not following the previous path rather following the curve a to b.
The point b indicates H = 0 for I = 0 with a certain value of B. This lagging of B behind H is called hysteresis. The point b explains that after removing of magnetizing force (H), magnetism property with little value remains in this magnetic material and it is known as residual magnetism (Br) or residual flux density.
The point b indicates H = 0 for I = 0 with a certain value of B. This lagging of B behind H is called hysteresis. The point b explains that after removing of magnetizing force (H), magnetism property with little value remains in this magnetic material and it is known as residual magnetism (Br) or residual flux density.
The point b indicates H = 0 for I = 0 with a certain value of B. This lagging of B behind H is called hysteresis. The point b explains that after removing of magnetizing force (H), magnetism property with little value remains in this magnetic material and it is known as residual magnetism (Br) or residual flux density.
The point b indicates H = 0 for I = 0 with a certain value of B. This lagging of B behind H is called hysteresis. The point b explains that after removing of magnetizing force (H), magnetism property with little value remains in this magnetic material and it is known as residual magnetism (Br) or residual flux density.
The point b indicates H = 0 for I = 0 with a certain value of B. This lagging of B behind H is called hysteresis. The point b explains that after removing of magnetizing force (H), magnetism property with little value remains in this magnetic material and it is known as residual magnetism (Br) or residual flux density.
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