A piece of ferric oxide with magnetic field intensity 106 A/m and susceptibility is 1.5 × 10-3. Find the magnetisation of the material.

The dependences of the magnetic susceptibility $$\left( \chi \right)$$ of a material with temperature (T) can be represented by $$\chi \propto \frac{1}{{T - \theta }},$$ where θ is the Curie-Weiss temperature. The plot of magnetic susceptibility versus temperature is sketched in the figure, as curves P, Q and R with curve Q having θ = 0. Which one of the following statements is correct?
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A

Curve R represents a paramagnet and Q a ferromagnetic field

B

Curve Q represents a ferromagnet and P an antiferromagnet

C

Curve R represents an antiferromagnet and Q a paramagnet

D

Curve R represents an antiferromagnet and Q a ferromagnet

A paramagnetic material had a magnetic field intensity of 104 A/m. If the susceptibility of the material at room temperature is 3.7×10-3, calculate the magnetisation.

A

37A/m

B

3.7A/m

C

370A/m

D

0

The ratio of intensity of magnetisation to the magnetisation force is known as

A

flux density

B

susceptibility

C

relative permeability

D

none of the above

A paramagnetic material had a magnetic field intensity of 104 A/m. If the susceptibility of the material at room temperature is 3.7×10-3, calculate the flux density in the material.

A

37Wb/m2

B

3.725Wb/m2

C

0.012612Wb/m2

D

0

Consider the following statement: a) Magnetic field lines are always form closed curve. b) Magnetic field lines start from north pole outside the magnet c) Magnetic field lines start from south pole outside the magnet Which of the following is a property of magnetic field lines?

A

Both a and b are correct

B

Both a and c are correct

C

Only b is correct

D

Only c is correct

A current carrying coil having magnetic moment M is placed in a magnetic field B. Initially the magnetic field is perpendicular to the plane of the coil and then coil turned about an axis such that the angle between the magnetic field and the plane of the coil become zero. Then choose the correct statement.

A

The initial torque on the coil was maximum.

B

The final torque on the coil was maximum.

C

Initial potential energy of the coil was zero.

D

All are correct.

In Paramagnetic oxygen analyzer, the expression for magnitude of force produced can be expressed as, F = C (K-KO), where K= magnetic susceptibility of surrounding gas and KO= magnetic susceptibility of sphere. C denotes which of the following?

A

Magnetic field strength

B

Magnetic gradient

C

Function of magnetic field strength and gradient

D

Magnetic flux

A piece of paraffin is placed in a uniform magnetic field H₀. The sample contains hydrogen nuclei of mass m_p, which interact only with external magnetic field. An additional oscillating magnetic field is applied to observe resonance absorption. If g₁ is the g-factor of the hydrogen nucleus, the frequency at which resonance absorption takes place, is given by

A

$$\frac{{3{g_1}e{H_0}}}{{2\pi {m_p}}}$$

B

$$\frac{{3{g_1}e{H_0}}}{{4\pi {m_p}}}$$

C

$$\frac{{{g_1}e{H_0}}}{{2\pi {m_p}}}$$

D

$$\frac{{{g_1}e{H_0}}}{{4\pi {m_p}}}$$

Find the magnetization of the material with susceptibility of 6 units and magnetic field intensity of 13 units.

A

2.16

B

6.2

C

78

D

1.3

If the velocity of a charged particle in perpendicular electric and magnetic field is 7.27 X 106m/s and the Electric field is 6 X 106 N/c, what should be the value of magnetic field for velocity sector?

A

0.45 T

B

0.78 T

C

0.83 T

D

0.94 T

A piece of ferric oxide with magnetic field intensity 106 A/m and susceptibility is 1.5 × 10-3. Find the magnetisation of the material.

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