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Q: The following are different factors that affect the diurnal variation in magnetic declination. The condition which may result in the maximum variation is _______________.
  • A. at the Equator during summer
  • B. at the Equator during winter
  • C. at the Magnetic Poles during winter
  • D. at the Magnetic Poles during summer
Correct Answer: Option D - • Diurnal variation due to rotation of earth about its own axis. • Diurnal variation more at pole and less at equator considerably more in summer than in winter. • It is more in day and less in night. • The rate of variation during 24 hours is variable.
D. • Diurnal variation due to rotation of earth about its own axis. • Diurnal variation more at pole and less at equator considerably more in summer than in winter. • It is more in day and less in night. • The rate of variation during 24 hours is variable.

Explanations:

• Diurnal variation due to rotation of earth about its own axis. • Diurnal variation more at pole and less at equator considerably more in summer than in winter. • It is more in day and less in night. • The rate of variation during 24 hours is variable.