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Questions  >>  CBSE XII  >>  Physics  >>  Magnetism and matter
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The earth's magnetic field from point to point in space . Does it also charge with time ? If so on what time scale does it change appreciably ?

$\begin{array}{1 1} \text{a few thousand years} \\ \text{a few hundred years } \\ \text{a few decades } \\ \text{can not be determined} \end{array} $

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