Interstellar space has an extremely weak magnetic field ≈ 10 - 12 T . Can there be any significant consequence of such a weak field?

Even though the magnetic field is very weak in interstellar space, but it is not zero. So, it will exert force on charged particles & moving in space and bend them in a circular path. The radius of the path will be too large to notice for a small distance, but space is unimaginably large, and at those scales, it is not insignificant.

It is claimed that the earth’s magnetic field approximates the field due to a magnetic dipole of moment 8 × 10 22 A / m 2 placed at the centre of the earth. Check the order of magnitude of the magnetic field.

The magnetic field of earth's dipole, at the equator plane which will be a broadside on position for earth's magnet, is given by B = μ 0 4 π m r 3 , where B is the magnetic field and m is magnetic dipole of moment B = 10 − 7 × 8 × 10 22 6 .4 × 10 6 2 = 0 .3 × 10 − 4 T B = 0 . 3 G

E M B I B E

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 12

EASY

12th ICSE

IMPORTANT

Earn 100

Earth is a huge magnetic dipole. Is the magnetic pole in the Northern Hemisphere a north or a south magnetic pole?

Important Questions on Magnetic Field and Earth's Magnetism

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 12

Earth is a huge magnetic dipole, In the northern hemisphere, do the magnetic lines of force associated with the earth’s magnetic field point towards the earth’s surface or away from it?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 13

If you made a map of magnetic field lines of earth at Melbourne in Australia, would the lines seem to go into the earth or come out of the earth?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 14

The earth’s field deviates from its dipole shape at distances larger than about

30000 km

above the earth. Why?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 15

Geologists claim that besides the main magnetic

N - S

poles, there are several local poles on the earth’s surface oriented in different directions. How is it possible?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 16

Interstellar space has an extremely weak magnetic field

(\approx 10^{- 12} T)

. Can there be any significant consequence of such a weak field?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 17

It is claimed that the earth’s magnetic field approximates the field due to a magnetic dipole of moment

8 \times 10^{22} A / m^{2}

placed at the centre of the earth. Check the order of magnitude of the magnetic field.

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 9 - Magnetic Field and Earth's Magnetism>QUESTIONS>Q 18

If it is assumed that earth’s magnetism is due to the presence of a large current-loop within the earth, then how will the plane of this loop be situated, and what will be the direction of current in it?

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