Question

Assertion: Vertical component of earth’s magnetic field is maximum at poles and minimum at equator. Reason: The declination is greater at higher latitudes and smaller near the equator
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Answer 1

Answer:

A. Both assertion and reason are correct and reason is the corret explanation of assertion.

Explanation:

Although the direction and magnitude of the field varies from place to place on the earth's surface, near the equator the vertical component is close to zero.

B.V. = B×sinθ

B.V. = vertical component of earth 's magnetic field;

B = earth's magnetic field at a place  = angle of dip

So, vertical component of earth magnetic field becomes zero when angle of dip becomes zero, i.e. at the magnetic equator.

So, the vertical component of earth's magnetic field is maximum at poles and minimum at the equator.