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What is dynamo effect?

Important Questions on Magnetism and Matter

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

The total intensity of the earth's magnetic field at equator is

5

units. What will be its value at the poles?

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's 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>Magnetism and Matter>The Earth's Magnetism

The dip angle at point, $P$ on earth's surface, is $45 °$ . If the dip angle is changed by $1 %$ then the change in the horizontal component of earth's magnetic field is:

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

Which of the following demonstrated that earth has a magnetic fied:

HARD

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's 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

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

The magnetic field and angle of dip at a place on the earth are

0.3 G

and

30 °

, respectively. The value of vertical component of the earth’s magnetic field at the place is _____.

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

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

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

A compass needle oscillates

20

times per minute at a place where the dip is

45 °

and the magnetic field is

B_{1}

. The same needle oscillates 30 times per minute at a place where the dip is

30 °

and magnetic field is

B_{2}

. Then

B_{1} : B_{2}

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

The relation between

B_{v,} B_{h}

and

B

is _____

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Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

Choose the correct option.

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Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

What is the angle of dip at a place where the horizontal component

(B_{H})

and vertical component

(B_{V})

of earth

'

s magnetic field are equal

:

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Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

The strength of the Earth’s magnetic field is

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Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

Earth's magnetic field has a horizontal component except at

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Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

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

0.25 \times 10^{- 4} Wb / m^{2}

and its vertical component is

0.35 \times 10^{- 4} Wb / m^{- 4}

. Then the earth's total magnetic field at that place is

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's Magnetism

The vertical component of the earth's magnetic field is

6 \times 10^{- 5} T

at any place where the angle of dip is

37 °

. The earth's resultant magnetic field at that place will be (Given

\tan 37 ° = \frac{3}{4}

)

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The 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>Magnetism and Matter>The 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,

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>The Earth's 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>Magnetism and Matter>The 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>Magnetism and Matter>The 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

What is dynamo effect?

Important Questions on Magnetism and Matter

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