MCQs of Magnetic forces, materials and inductance (Electromagnetics Field - 3140912)

Electromagnetics Field (3140912) MCQs

MCQs of Magnetic forces, materials and inductance

Showing 161 to 170 out of 171 Questions

161.

In a certain material for which, μ_r = 6.5 and H = 10ā_x+25ā_y−40ā_z A/m. The magnetic flux density B is

(a)	(82ā_x+204ā_y−327ā_z) μWb/m²
(b)	(82ā_x+204ā_y−327ā_z) μA/m
(c)	(82ā_x+204ā_y−327ā_z) mT
(d)	(82ā_x+204ā_y−327ā_z) mA/m

162.

In a certain material for which, μ_r = 6.5 and H = 10ā_x+25ā_y−40ā_z A/m. The magnetization M is

(a)	(75ā_x+187.5ā_y−300ā_z) A/m
(b)	(75ā_x+187.5ā_y−300ā_z) mA/m
(c)	(55ā_x+137.5ā_y−220ā_z) A/m
(d)	(55ā_x+137.5ā_y−220ā_z) mA/m

163.

In a certain material for which, μ_r = 6.5 and H = 10ā_x+25ā_y−40ā_z A/m. The magnetic energy density is

(a)	19 mJ/m²
(b)	9.5 mJ/m²
(c)	16.3 mJ/m²
(d)	32.6 mJ/m²

164.

For a given material magnetic susceptibility magnetic susceptibility χ_m = 3.1 and within which B = 0.4yā_z T. The magnetic field H is

(a)	986.8y(ā_z) kA/m
(b)	151.6y(ā_z) kA/m
(c)	102.7y(ā_z) kA/m
(d)	77.6y(ā_z) kA/m

165.

For a given material magnetic susceptibility magnetic susceptibility χ_m = 3.1 and within which B = 0.4yā_z T. The magnetization M is

(a)	241y(ā_z) kA/m
(b)	318.2y(ā_z) kA/m
(c)	163y(ā_z) kA/m
(d)	None of above

166.

A particular material has 2.7×10²⁹ atoms/m³ and each atom has a dipole moment of 2.6×10^-30(ā_y) A/m². The H in material is (μ_r = 4.2)

(a)	2.94ā_y A/m
(b)	0.22ā_y A/m
(c)	0.17ā_y A/m
(d)	2.24ā_y A/m

167.

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)	47.6 A/m
(b)	23.4 A/m
(c)	16.3 A/m
(d)	8.4 A/m

168.

A uniform field H = −600ā_y 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

(a)	0.226 J/m³
(b)	1.452 J/m³
(c)	1.68 J/m³
(d)	0.84 J/m³

169.

For a given ferrite material operating in linear mode, B = 0.05 T and μ_r = 50. The magnetic susceptibility χ_m is

(a)	49
(b)	50
(c)	51
(d)	0.02

170.

For a given ferrite material operating in linear mode, B = 0.05 T and μ_r = 50. The magnetic field H is

(a)	1 mA/m
(b)	125 A/m
(c)	796 A/m
(d)	1000 A/m

Showing 161 to 170 out of 171 Questions