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How does a deflection magnetometer work?

Important Questions on Properties of Magnets and Terrestrial Magnetism

EASY

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

At a point

A

on the earth’s surface the angle of dip,

δ = + 25 °

. At a point

B

on the earth’s surface, the angle of dip,

δ = - 25 °

. We can interpret that:

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

Two bar magnets oscillate in a horizontal plane in earth's magnetic field with time periods of

3 s

and

4 s

respectively. If their moments of inertia are in the ratio of

3 : 2

then the ratio of their magnetic moments will be

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

θ_{1}

and

θ_{2}

be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip

θ

is given by

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

A jet plane with a wing-span of

25 m

is travelling horizontally towards the east with a speed of

3600 km / hour

. If the Earth's magnetic field at the location is

4 \times 10^{- 4} T

and the angle of dip is

30 °

, then, the potential difference between the ends of the wing is

HARD

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

Describe the experiment to compare the magnetic moments of two bar magnets, using deflection magnetometer by deflection method in tan B position under the following heads : Derivation of formula

EASY

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

At a certain place, the horizontal component of earth's magnetic field is

\frac{1}{\sqrt{3}}

times the vertical component. The angle of dip at that place is

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

A short bar magnet is placed in the magnetic meridian of the earth with North Pole pointing north. Neutral points are found at a distance of $30 cm$ from the magnet on the East-West line, drawn through the middle point of the magnet. The magnetic moment of the magnet in ${Am}^{2}$ is close to:

(Given $\frac{μ_{0}}{4 π} = 10^{- 7}$ in SI units and $B_{H} =$ Horizontal component of earth's magnetic field $= 3.6 \times 10^{- 5}$ Tesla.)

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

What do you mean by the angle of dip at a place? At what place on the earth's surface, the vertical and horizontal components of the earth's magnetic field be equal?

EASY

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

From separate magnet method of vibrational magnetometer, describe the method of comparison of magnetic moment of two magnets under the following points : Two precautions

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

Describe the experiment to compare the magnetic moments of two bar magnets, using deflection magnetometer by deflection method in

\tan B

position under the following heads : Labelled diagram

EASY

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

The strength of the Earth’s magnetic field is

HARD

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

From separate magnet method of vibrational magnetometer, describe the method of comparison of the magnetic moment of two magnets under the following points : Derivation of the formula.

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

At certain place, horizontal component is

\frac{1}{\sqrt{3}}

times the vertical component. The angle of dip is

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

A magnetic compass needle oscillates

30

times per minute at a place where the dip is

45 °

and

40

times per minute where the dip is

30 °

. If

B_{1}

and

B_{2}

are the net magnetic fields due to the earth at the two places respectively, then the ratio

\frac{B_{1}}{B_{2}}

is approximately equal to

EASY

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

A Jet plane is travelling west at

450

metres per second. If the horizontal component of Earth's magnetic field is

4 \times 10^{- 4}

Tesla and angle of dip is

30 °,

Then the vertical component is

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

The horizontal component of the earth's magnetic field is

3.6 \times 10^{- 5} t e s l a

where the dip angle is

60 °

. The magnitude of the earth's magnetic field is,

HARD

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

A compass needle of oscillation magnetometer oscillates

20

times per minute at a place

P

of dip

30 °

. The number of oscillations per minute become

10

at another place

Q

60 °

dip. The ratio of the total magnetic field at the two places

(B_{Q} : B_{P})

is:

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

From separate magnet method of vibrational magnetometer, describe the method of comparison of the magnetic moment of two magnets under the following points: Observation table

MEDIUM

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

The length

l

of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is

2 s

. The magnet is cut into three equal parts of length

\frac{l}{3}

each. If these parts are placed on each other with their like poles together, then the time period of this combination is

HARD

Physics>Electricity and Magnetism>Properties of Magnets and Terrestrial Magnetism>Earth's Magnetism

To measure the magnetic moment of a bar magnet, one may use

How does a deflection magnetometer work?

Important Questions on Properties of Magnets and Terrestrial Magnetism

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