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The total intensity of the earth's magne...

The total intensity of the earth's magnetic field at the equator is 5 nits. What is its magnetude and direction at the poles?

A

2 units, horizontal

B

3 units, vertical

C

4 units and inclined at `45^(@)` to the horizontal

D

5 units, vertical

Text Solution

Verified by Experts

The correct Answer is:
D
At the equator, Angle of dip `delta=0` and `H=R cos delta`
where R is the total intensity of the earth's magnetic field.
`:. H=R cos delta =R cos 0^(@) =R`
At the poles, `delta =90^(@) :. H=0`
and `V=R sin 90^(@)=R=5` units
[The direction of R is horizontal at the equator and vertical at the pole.]
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