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AP EAMCET20224 Jul 2022Evening ShiftPhysicsMagnetic Properties of MatterActual

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 . 3 G . Then the magnitude of the earth's magnetic field at the location is

Options

  1. A3 5 G
  2. B3 G
  3. C20 3 G
  4. D2 3 G

Correct answer

A. 3 5 G

Step-by-step solution

Horizontal component magnetic field at a point where dip angle is δ is given by, B H = B cos δ ⇒ B = B H cos δ = 0 . 3 × 2 3 = 3 5   G

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