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Given,
The horizontal component of earth’s magnetic field,
= 0.35 G
Angle made by the needle with the horizontal plane at the place = Angle of dip =
= 
We know,
= B cos
, where B is earth's magnetic field
B =
/cos
= 0.35/(cos
) = 0.377 G
The earth’s magnetic field strength at the place is 0.377 G.