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Which of the following is responsible fo...

Which of the following is responsible for the earth's magnetic field ?

A

Intensity of cosmic rays is more at the poles than at the equator

B

Earth is surrounded by an ionosphere

C

Earth is a planet rotating about the north-south axis

D

Large quantity of iron ore is found on the earth

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The correct Answer is:
A
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AAKASH INSTITUTE-MAGNETISM AND MATTER -EXERCISE
  1. Force between two identical bar magnets whose centres are r metre apar...

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  2. Gauss's law in magnelism ensures that

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  3. Which of the following is responsible for the earth's magnetic field ...

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  4. The angle between the magnetic meridian and geographical meridian is c...

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  5. Isogonic lines are the lines joining places of…………………….. .

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  6. At a place, if the earth's horizontal and vertical components of magne...

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  7. A dip circle is placed in magnetic meridian then the magnetic needle w...

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  8. A dip needle in a plane perpendicular to magnetic meridian will remain

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  9. The original value of the angle of dip at a place is 45^(@) what will...

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  10. A dip circle is placed in geographic meridian at a place where dip and...

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  11. The values of apparent angles of dip in two places measured in two mut...

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  12. A magnetic dipole of magnetic moment 1.44 A m^2 is placed horizontally...

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  13. The time period of a vibration magnetometer is T(0). Its magnet is rep...

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  14. The length of a magnet is large compared to its width and breadth. The...

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  15. A defiection magnetometer works on

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  16. The arms of a deflection magnetometer in tangent B position are placed...

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  17. The deflection magnetometer is most sensitive when the defiection the...

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  18. Two short magnet having magnetic moment in the ratio 27:8, when placed...

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  19. To work with a tangent galvanometer, how do you set its coil?

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  20. What is a reduction factor of tangent galvanometer and its unit of mea...

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