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A : In earn may nave even reversea the d...

A : In earn may nave even reversea the direction of its field several time during its history of 4 to 5 billion years.
R: Earth's magnetic field gets weakly' recorded' in certain rocks during solidification.

A

If both Assertion & Reason are the true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reson is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

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Answer the following questions: (a) The earth's magnetic field varies from point to point in space. Does is also change with time? If so, on what time scale does it change appreciably? (b) The earth's core is known to contain iron. Yet geologists do not regard this as a source of earth's magnetism, why? (c) The charged currents in the outer conducting regions of earth's core are thought to be possible for earth's magnetism. What might be the battery to sustain these currents? (d) The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologist know about the earth's field in such distant past? (e) The earth's field departs from its dipole shape substantially at large distances (greater than about 30000km). What agencies may be responsible for this distortion? (f) Interstellar space has an extremely weak magnetic field of the order of 10^(-12)T . Can such a weak field be of any significant consequence? Explain.

The total intensity of the earth's magnetic field at the equator is 5 nits. What is its magnetude and direction at the poles?

The earth's magnetic field at geomagnetic poles has a magnitude 8xx10^(-5)T . Find the magnitude and the direction of the field at a point on the earth's surface where the radius makes an angle of 120^(@) with its axis of the earth's assumed magnetic dipole. What is the inclination dip at this point?

The earth's magnetic field is approximately like that of a giant magnetic dipole, whose axis is inclined roughly 20^@ west of the axis of rotation of earth which is the geographic N-S direction. The strength of earth's magnetic field is of the order of 10^-4 tesla . Three magnetic elements of earth are: Magnetic declination (theta) , magnetic inclination or magnetic dip (delta) and horizontal component (H) of earth's magnetic field. Magnetic declination is the small angle between magnetic axis and geographic axis at a place. Magnetic dip at a place is the angle, which the direction of total strength of earth's magnetic field (R) makes with a horizontal line in magnetic meridian. If H is horizontal component and V is vertical component of earth's magnetic field, then H=Rcos delta , V=Rsin delta and R=sqrt(H^2+V^2) . At a place on the surface of earth. H is of the order of 3*3xx10^-5tesla . Magnetic declination is

The earth's magnetic field is approximately like that of a giant magnetic dipole, whose axis is inclined roughly 20^@ west of the axis of rotation of earth which is the geographic N-S direction. The strength of earth's magnetic field is of the order of 10^-4 tesla . Three magnetic elements of earth are: Magnetic declination (theta) , magnetic inclination or magnetic dip (delta) and horizontal component (H) of earth's magnetic field. Magnetic declination is the small angle between magnetic axis and geographic axis at a place. Magnetic dip at a place is the angle, which the direction of total strength of earth's magnetic field (R) makes with a horizontal line in magnetic meridian. If H is horizontal component and V is vertical component of earth's magnetic field, then H=Rcos delta , V=Rsin delta and R=sqrt(H^2+V^2) . At a place on the surface of earth. H is of the order of 3*3xx10^-5tesla . At magnetic poles, a compass needle points out

The earth's magnetic field is approximately like that of a giant magnetic dipole, whose axis is inclined roughly 20^@ west of the axis of rotation of earth which is the geographic N-S direction. The strength of earth's magnetic field is of the order of 10^-4 tesla . Three magnetic elements of earth are: Magnetic declination (theta) , magnetic inclination or magnetic dip (delta) and horizontal component (H) of earth's magnetic field. Magnetic declination is the small angle between magnetic axis and geographic axis at a place. Magnetic dip at a place is the angle, which the direction of total strength of earth's magnetic field (R) makes with a horizontal line in magnetic meridian. If H is horizontal component and V is vertical component of earth's magnetic field, then H=Rcos delta , V=Rsin delta and R=sqrt(H^2+V^2) . At a place on the surface of earth. H is of the order of 3*3xx10^-5tesla . The intensity of earth's magnetic field at the surface of earth is of the order of

AAKASH INSTITUTE-MAGNETISM AND MATTER -ASSIGNMENT (SECTION D)
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  2. A: A system can have magnetic moments even though its net charge is ze...

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  3. A: The earth's magnetic field not only varies from point to point in s...

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  4. A : In earn may nave even reversea the direction of its field several ...

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  5. A: The earth's field departs from its dipole shape substantially at la...

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  6. A: Paramagnetic sample displays greater magnetisation (for the magneti...

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  7. A: Diamagnetism is almost indipendent of temperature. R: The induced...

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  8. A: If a toroid uses bismuth for its core, then the field in the core w...

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  9. A: Peramability of a ferromagnetic material is independent of the magn...

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  10. A: The maximum possible magnetization of a paramagnetic sample is of t...

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  11. A: A system displaying a hysteresis loop such as a ferromagnet, is a d...

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  12. A: Ceramics (specially treated barium iron oxides) also called ferrite...

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  13. A: magnetic field lines are continuous and form closed loops. R: Mag...

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  14. A: Superconductors are perfect diamagnetic. R: Superconductors are p...

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  15. A: Superconducting magnets are gainfully exploited in running magnetic...

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  16. A: Diamagnetism is exhibited by all the substances. R: Diamagentism ...

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  17. A: Above curie-point a ferromagnetic substance behaves as a paramagnet...

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  18. A: Earth's magnetism protects us from many of thte harmful cosmic rays...

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  19. A: In a diamagnetic substance each atom has a non-zero dipole moment b...

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  20. A: The magnetic field lines have a tendency to avoid entering the body...

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