A magnetic needle has magnetic moment undefined and moment of inertia I = 7 . 5 × 10 - 6 kgm 2 . It performs 10 complete oscillations in 6 . 70 s . What is the magnitude of the magnetic field ? B = 9 . 8 × 10 - 5 T

In the given question we have to use the concept of magnetic field. Time period = 6 . 70 10 = 0 . 67 s Magnetic field is given by B = 4 π 2 I m T 2 w h e r e B = m a g n e t i c f i e l d m = m a g n e t i c m o m e n t T = t i m e p e r i o d I = M o m e n t o f i n e r t i a Putting the values' B = 4 × 3 . 14 2 × 7 . 5 × 10 - 6 6 . 7 × 0 . 67 2 = 9 . 8 × 10 - 5 T \

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Three magnets of same length but moments $M, 2 M$ and $3 M$ are arranged in the form of an equilateral triangle with opposite poles nearer, the resultant magnetic moment of the arrangement is:

Important Questions on Properties of Magnets and Terrestrial Magnetism

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 14

At a place, the dip needle makes an angle

45 °

with the horizontal. If a mass of

7 g

is loaded on the upper end of the needle, the dip angle is reduced to

30 ° .

What mass will make the needle horizontal ?

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 15

A short bar magnet has a magnetic moment of $0.24 {JT}^{- 1} .$ Calculate the magnitude of the magnetic field produced by the magnet at a distance $10 cm$ from the centre of the magnet, on the axis of the magnet.

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 16

Find the magnetic field due to a dipole of magnetic moment

1.2 {A . m}^{2}

at a point

0.5 m

away from it in a direction making an angle of

60 °

with the dipole axis.

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 17

A short bar magnet placed with its axis at $30 °$ to a uniform magnetic field of $0.2 T$ experiences a torque of $0.06 N . m .$

Calculate the magnetic moment of the magnet and

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 17

A short bar magnet placed with its axis at $30 °$ to a uniform magnetic field of $0.2 T$ experiences a torque of $0.06 N . m .$

find out what orientation of the magnet corresponds to stable equilibrium in the magnetic field.

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 18

A magnetic needle has magnetic moment undefined and moment of inertia

I = 7.5 \times 10^{- 6} {kgm}^{2} .

It performs

10

complete oscillations in

6.70 s .

What is the magnitude of the magnetic field ?

[B = 9.8 \times 10^{- 5} T]

EASY

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 19

A dip circle is set at

45^{\circ}

to the magnetic meridian, then the apparent dip is

30^{\circ}

Calculate the true dip.

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IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 7 - Properties of Magnets and Terrestrial Magnetism>EXERCISE 7>Q 1

If a magnet is cut into four equal parts such that their length and breadths are equal. Pole strength of each part is

Three magnets of same length but moments M,2M and 3M are arranged in the form of an equilateral triangle with opposite poles nearer, the resultant magnetic moment of the arrangement is:

Important Questions on Properties of Magnets and Terrestrial Magnetism

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Three magnets of same length but moments $M, 2 M$ and $3 M$ are arranged in the form of an equilateral triangle with opposite poles nearer, the resultant magnetic moment of the arrangement is: