Test: Magnetostatics
20 Questions MCQ Test GATE Electrical Engineering (EE) 2023 Mock Test Series | Test: Magnetostatics
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A rectangular loop of wire in free space joins points A(1, 0, 1) to B(3, 0, 1) to C(3, 0, 4) to D(1, 0, 4) to A. The wire carries a current of 6 mA flowing in the uz direction from B to C. A filamentary current of 15 A flows along the entire z, axis in the uz directions.
Que: The force on side BC is
A rectangular loop of wire in free space joins points A(1, 0, 1) to B(3, 0, 1) to C(3, 0, 4) to D(1, 0, 4) to A. The wire carries a current of 6 mA flowing in the uz direction from B to C. A filamentary current of 15 A flows along the entire z, axis in the uz directions.
Que: The force on side AB is
The field from the long wire now varies with position along the loop segment.
A rectangular loop of wire in free space joins points A(1, 0, 1) to B(3, 0, 1) to C(3, 0, 4) to D(1, 0, 4) to A. The wire carries a current of 6 mA flowing in the uz direction from B to C. A filamentary current of 15 A flows along the entire z, axis in the uz directions.
Que: The total force on the loop is
This will be the vector sum of the forces on the four sides. By symmetry, the forces on sides AB and CD will be equal and opposite, and so will cancel. This leaves the sum of forces on side BC and DA
Consider the rectangular loop on z = 0 plane shown in fig. The magnetic flux density is B = 6 xux - 9 yuy + 3zuz Wb/m2. The total force experienced by the rectangular loop is
Three uniform current sheets are located in free space as follows: 8uz A/m at y = 0, -4uz A/m at y = 1 and -4uz A/m at y = -1. Let F be the vector force per meter length exerted on a current filament carrying 7 mA in the uL direction.
Que: If the current filament is located at x = 0, y = 0.5 andu uL = uZ , then F is
Within the region 1 < y <1, the magnetic fields from the two outer sheets (carrying -4 uz A/m) cancel, leaving only the field from the center sheet. Therefore
Three uniform current sheets are located in free space as follows: 8uz A/m at y = 0, -4uz A/m at y = 1 and -4uz A/m at y = -1. Let F be the vector force per meter length exerted on a current filament carrying 7 mA in the uL direction.
Que: If the current filament is located at y = 0.5, z = 0, and uL = ux, then F is
Two infinitely long parallel filaments each carry 100 A in the uz direction. If the filaments lie in the plane y = 0 at x = 0 and x = 5 mm, the force on the filament passing through the origin is
A conducting current strip carrying K = 6uz A/m lies in the x = 0 plane between y = 0.5 and y = 1.5 m. There is also a current filament of I = 5 A in the uz direction on the z –axis.
Que: The force exerted on the filament by the current strip is
The field from the current strip at the filament location
A conducting current strip carrying K = 6uz A/m lies in the x = 0 plane between y = 0.5 and y = 1.5 m. There is also a current filament of I = 5 A in the uz direction on the z –axis.
Que: The force exerted on the strip by the filament is
In a material the magnetic field intensity is H = 1200A/m when B = 2 Wb/m2. When H is reduced to 400 A/m, B =1.4 Wb/m2. The change in the magnetization M is
In a certain material for which μr = 6.5 ,
H = 10ux + 25uy - 40uz A/m
Que:
The magnetic susceptibility χm of the material is
In a certain material for which μr = 6.5 , H = 10ux + 25uy - 40uz A/m
Que: The magnetic flux density B is
In a certain material for which μr = 6.5 , H = 10ux + 25uy - 40uz A/m
Que: The magnetization M is
In a certain material for which μr = 6.5 , H = 10ux + 25uy - 40uz A/m
Que: The magnetic energy density is
For a given material magnetic susceptibility χm = 3.1 and within which B = 0.4 yuz T.
Que: The magnetic field H is
For a given material magnetic susceptibility χm = 3.1 and within which B = 0.4 yuz T.
Que: The magnetization M is
A particular material has 2.7 x 1029 atoms/m3 and each atom has a dipole moment of 2.6 x 1030 uy A .m2. The H in material is (μr = 4.2 )
In a material magnetic flux density is 0.02 Wb/m2 and the magnetic susceptibility is 0.003. The magnitude of the magnetization is
A uniform field H = -600 uy A/m exist in free space. The total energy stored in spherical region 1 cm in radius centered at the origin in free space is
The magnetization curve for an iron alloy is
approximately given by If H increases from 0 to 210 A/m, the energy stored per unit volume in the alloy is
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