If the Earth's magnetic field at the equator is about 4 × 10 - 5 T , what is its approximate magnetic dipole moment? (radius of earth = 6400 km )

The equatorial magnetic field is given by B = μ 0 4 π m r 3 where m is magnetic dipole moment r is radius of earth μ 0 is magnetic constant permeability of free space vacuum ∴ m = 4 π B r 3 μ 0 ⇒ m = 4 π × 4 × 10 - 5 × ( 6400 × 10 3 ) 3 4 π × 10 - 7 = 1 . 05 × 10 23 Hence, magnetic dipole moment is 1 . 05 × 10 23 Am 2 .

The horizontal component of the Earth's magnetic field at a certain place is 2 . 6 × 10 - 5 T and the angle of dip is 60 ° . What is the magnetic field of the earth at this location?

Horizontal component of magnetic field, B h = 2 . 6 × 10 - 5 T Angle of dip, θ = 60 ° Angle of dip is the angle that is made by the earth's magnetic field lines with the horizontal. cos θ = B h B ⇒ B = B h cos θ = 2 . 6 × 10 - 5 cos 60 = 5 . 2 × 10 - 5 T Hence, magnetic field at mentioned location is 5 . 2 × 10 - 5 T .

Classify the following materials with regard to magnetism: Manganese, cobalt, Nickel, Bismuth, Oxygen, Copper.

Paramagnetic materials. The materials which are not strongly attracted to a magnet are known as paramagnetic material. Diamagnetic materials. The materials which are repelled by a magnet such as zinc. Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. Most of the ferromagnetic materials are metals. From given materials, manganese and oxygen are paramagnetic materials. Cobalt and nickel are ferromagnetic materials. Bismuth and copper are the diamagnetic materials.

What is the magnetic moment associated with a solenoid?

A solenoid is a coil with a length greater than its diameter and is a type of electromagnet to produce controlled magnetic fields by passing an electric current through it. Magnetic moment is defined as the property of a magnet that interact with an applied field to give a mechanical moment. The magnetic moment of Solenoid, m = N I A Where N is the number of turns, I is solenoid current and A is the cross sectional area of the solenoid.

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In the Bohr atom model the electrons move around the nucleus in circular orbits. Obtain an expression the magnetic moment $μ$ of the electron in a hydrogen atom in terms of its angular momentum $L$ .

Important Questions on Magnetism and Matter

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IMPORTANT

Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 4

A solenoid of length

22.5 cm

has a total of

900

turns and carries a current of

0.8 A

. What is the magnetising field

H

(in

A m^{- 1}

) near the centre of solenoid?

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Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 5

A bar magnet of length

0.1 m

and with a magnetic moment of

5 {Am}^{2}

is placed in a uniform magnetic field of intensity

0.4 T

, with its axis making an angle of

60 °

with the field. What is the torque on the magnet?

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Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 6

If the Earth's magnetic field at the equator is about

4 \times 10^{- 5} T

, what is its approximate magnetic dipole moment? (radius of earth

= 6400 km

)

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IMPORTANT

Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 7

The horizontal component of the Earth's magnetic field at a certain place is

2.6 \times 10^{- 5} T

and the angle of dip is

60 °

. What is the magnetic field of the earth at this location?

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Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 8

A solenoid of insulated wire is wound on a core with relative permeability

400

. If the number of turns per metre is

1000

and the solenoid carries a current of

2 A

, calculate

H, B

and magnetisation

M

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Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 8.1

Answer the following question regarding earth’s magnetism:
A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field.

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Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 8.1

Answer the following question regarding earth’s magnetism: The angle of dip at a location in southern India is about

18 °

. Would you expect a greater or smaller dip angle in Britain?

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Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 8.1

Answer the following question regarding earth’s magnetism:

If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the ground?

In the Bohr atom model the electrons move around the nucleus in circular orbits. Obtain an expression the magnetic moment μ of the electron in a hydrogen atom in terms of its angular momentum L.

Important Questions on Magnetism and Matter

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In the Bohr atom model the electrons move around the nucleus in circular orbits. Obtain an expression the magnetic moment $μ$ of the electron in a hydrogen atom in terms of its angular momentum $L$ .