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Which of the following is true about diurnal variation?


1. It is greater in summer than in winter.
2. It is greater at smaller latitudes than at higher latitudes
3. It is greater at magnetic equator points.
4. It is greater in winter than in summer

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Correct Answer - Option 1 : It is greater in summer than in winter.

Diurnal variation:

It is an oscillation of the needle from its mean position. The amount of this varies from 1 minute to 12 minutes at different places. The following factors influence its magnitude;

  • It is more in the day and less in the night
  • It is more in summer and less in winter.
  • It is more near magnetic poles and less near the equator.

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