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A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at `22^@` with the horizontal. The horizontal component of the earth's magnetic field at the place is known to be `0*35G`. Determine the strength of the earth's magnetic field at the place.

A

0.38 G

B

0.35 G

C

0.30 G

D

0.40 G

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The correct Answer is:
A
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A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 22^@ with the horizontal. The horizontal component of the earths magnetic field at the place is known to be 0*35G . Determine the strength of the earths magnetic field at the place.

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 22^(@) with the horizontal . The horizontal componemt of the earth's magnetic field at the place is know to be 0.35 G . Determine the magnitude of the earth's magnetic field at the place .

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A magnetic needle free to rotate in a vertical plane parallel to magnetic meridian has its north tip down at 60^@ with the horizontal. The horizontal component of earth's magnetic field at that place is 0*4G . Determine the magnitude of earth's magnetic field at the place.

A magnetic needle free to rotate about the vertical direction (compass ) point 3.5 west of the geographic north . Another magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 18^(@) with the horizontal . The magnitude of the horizontal component of the earth ' magnetic field at the place is known to be 0.40 G . what is the direction and magnitude of the earth's magnetic field at the place ?

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