3 1 Rnt 3 24 At a place on earth horizontal component of earth s...
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3 1 Rnt 3 24 At a place on earth horizontal component of earth s magnetic field is B and B and vertical component of earth s magnetic field is B If a magnetic needle is kept in a vertical plane making an angle a with the magnetic meridian then square of time period of vibration needle in this plane is proportional to 1 B cos a 4 1 B cosa B 2 4 Rt
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