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Question

Isogonic lines on a magnetic map will have

A
Zero angle of dip
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B
Zero angle of declination
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C
The same angle of dip
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D
The same angle of declination
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Solution

The correct option is D The same angle of declination
Magnetic declination is the angle on the horizontal plane between magnetic north and true north.
Thus lines on the earth's surface along which the declination has the same constant value are isogonic lines.

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