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Short answer type Question
Q.5. At which places on earth's surface, the angles of dip are 90 °   a n d   0 ° ?
 

Dear Student,
At the two magnetic poles of our Earth, the magnetic needle rests vertically thus the angle is 90o  as angle between magnetic field and surface is 90o

 Angle of dip is zero at equator as magnetic field runs parallel to the Earths' surface.

Regards

 

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Angle of dip is +90° at north pole and -90° at south pole, which means it is 90° at the poles and 0° at the equator.
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