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A magnetic needle which is free to rot...

A magnetic needle which is free to rotate always shows

A

North- East direction

B

South- west direction

C

East-west direction

D

North-south direction

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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 0.35 G. Determine the magnitude of the earth's magnetic field at the place.

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