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A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

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Important Questions on Matter and Magnetism

HARD

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The earth's magnetic field was flipped by

180 °

a million years ago. This flip was relatively rapid and took

10^{5}

years. Then the average change in orientation per year during the flip closest to

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The strength of the Earth’s magnetic field is

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial 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

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

Choose the correct option.

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The vertical component of earth's magnetic field at a place is

\sqrt{3}

times the horizontal component the value of angle of dip at this place is

MEDIUM

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

At an angle of

30 °

to the magnetic meridian, the apparent dip is

45 ° .

Find the true dip:

MEDIUM

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

At certain place, horizontal component is

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

times the vertical component. The angle of dip is

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The plane of a dip circle is set in the geographic meridian and the apparent dip is

δ_{1}

. It is then set in a vertical plane perpendicular to the geographic meridian. The apparent dip angle is

δ_{2}

. The declination

θ

at the place is

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

Choose the wrong statement.

MEDIUM

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial 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

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

B_{H} = 4 \times 10^{- 5} T

and

B_{v} = 2 \times 10^{- 5} T

, then the Earth's total field at the place is (in

T

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial 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:

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

Select the correct statement from the following:

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The relation between

B_{v,} B_{h}

and

B

is _____

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

In the magnetic meridian of a certain place, the horizontal component of the dip angle is

45 ° .

What is the magnetic field of the earth at this location?
(Use Horizontal component of the magnetic field to be

0.26 G

)

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The strength of earth's magnetic field on the earth's surface is of the order: of

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial Magnetism

The earth's magnetic field at a certain place has a horizontal component

0.3 G

and the total strength

0.5 G .

The angle of dip is

EASY

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial 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>Matter and Magnetism>Terrestrial 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

MEDIUM

Physics>Electricity and Magnetism>Matter and Magnetism>Terrestrial 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

Important Questions on Matter and Magnetism

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