1.

At magnetic equator, total intensity of Earth's magnetic field is I_(E) and at poles it is I_(p). They are related as

Answer»

`2 I_(P) = I_(E)`
`I_(P) = 2I_(E)`
`sqrt3I_(P) = I_(E)`
`I_(P) = 2I_(E)`

Solution :TOTAL intensity of Earth.s magnetic filed, in TERMS of `lambda` is, `I = I_(0) sqrt(1+3.sin^(2)lambda,)`where `l_(0) = M/R^(3)`. Here M and R DENOTE the magnetie MOMENT and radius of Earth respectively.
At magnetic equator , `I_(E) = I_(0) = sqrt(1 + 3.sin^(2)theta) = I_(0)`
At poles, `I_(P) = I_(0) sqrt(1+3.sin^(2)90^(@)) = I_(0)sqrt(1+3 = 2I_(0)`
`therefore I_(P) = 2I_(0) implies I_(P)2I_(E) [ :. I_(0) = I_(E)]`


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