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Define angle of dip. Deduce the relation...

Define angle of dip. Deduce the relation connecting angle of dip and horizontal component of earth's magnetic field at a place.

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In fig. CDAB is the magnetic meridian . Magnetic field to earth `vecB_E` at the place is inclined at an angle, equal to angle of dip , `delta` from horizontal direction along magnetic meridian . Hence , horizontal component `vecB_H` of earth.s magnetic field will be given by
`B_H = B_E . cos delta ` or `(B_H)/(B_E)= cos delta`
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