Find the amount of work done in changing the position of pole ( N - S to S - N ) of a bar magnet of magnetic moment 0 . 2 JT - 1 in uniform field of 8 . 0 T .

Given: Magnetic moment of the magnet M = 0 . 2 J T - 1 , and Magnetic field B = 8 . 0 T . The energy stored in the system of magnet placed in a uniform magnetic field is given as: U = - M → · B → = - M B cos θ The initial angle between the magnetic moment and the magnetic field is θ i = 0 ° and the final angle is θ f = 180 ° . The work done in changing the position of magnet is given as: W = U f - U i = - M B cos θ f - cos θ i = - 0 . 2 × 8 . 0 × cos 180 ° - cos 0 ° = - 1 . 6 × - 2 = 3 . 2 J

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12th West Bengal Board

IMPORTANT

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Two magnetic poles, one of which is $8$ times as strong as the other, exerts on each other a force equal to the weight of $800 mg$ , when placed $10 cm$ apart. Calculate the strength of the two poles.

Important Questions on Properties of Magnets and Terrestrial Magnetism

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 2

A bar magnet has poles of strength

64 Am

which are

0.25 m

apart. What is the magnetic moment of the magnet ?

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 3

Find the magnetic field due to a dipole of magnetic moment

2 {Am}^{2}

at point

1 m

away from it in a direction making an angle

60 °

with the dipole axis.

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 4

A short bar magnet of magnetic moment $0.9 {JT}^{- 1}$ is placed with its axis at $30 °$ to a uniform magnetic field. It experiences a torque of $0.063 Nm .$

Calculate the strength of the magnetic field and

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 4

A short bar magnet of magnetic moment $0.9 {JT}^{- 1}$ is placed with its axis at $30 °$ to a uniform magnetic field. It experiences a torque of $0.063 Nm .$ hat orientation of the bar magnet corresponds to its equilibrium position in the magnetic field?

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 5

A bar-magnet placed in a uniform magnetic field of

0.3 T

, with its axis at

30 °

to the field, experiences a torque of

0.06 N m

. Find the magnetic moment of the bar-magnet.

HARD

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 6

Find the amount of work done in changing the position of pole

(N - S

S - N)

of a bar magnet of magnetic moment

0.2 {JT}^{- 1}

in uniform field of

8.0 T .

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 7

A ship is sailing due east according to Mariner's compass. If the declination of that place is

18 °

east of north, what is the actual direction of the ship ?

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 8

What will be the value of vertical component and total intensity of earth's magnetic field at a place where dip is

60 °

? Horizontal component of earth's magnetic field is

0.3 \times 10^{- 4} T

Two magnetic poles, one of which is 8 times as strong as the other, exerts on each other a force equal to the weight of 800 mg, when placed 10 cm apart. Calculate the strength of the two poles.

Important Questions on Properties of Magnets and Terrestrial Magnetism

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Two magnetic poles, one of which is $8$ times as strong as the other, exerts on each other a force equal to the weight of $800 mg$ , when placed $10 cm$ apart. Calculate the strength of the two poles.