A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip…

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 30° with the horizontal. The horizontal component of the earth's magnetic field at the place is 0.3G. Then the magnitude of the earth's magnetic field at the location is
  1. 35G
  2. 3G
  3. 203G
  4. 23G

Solution

Horizontal component magnetic field at a point where dip angle is δ is given by,

BH=Bcosδ⇒B=BHcosδ=0.3×23=35 G

Asked in: AP EAMCET 2022 (04 Jul Shift 2)

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