Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A compass needle oscillates 20 times per minute at a place where the dip is 30° and 30 times per minute where the dip is 60°. The ratio of total magnetic field due to the earth at two places respectively is 
. The value of x is .
Text Solution
Verified by ExpertsThe correct answer is:
243
(243)
The formula for time period is given by
Let
= 30°
The ratio of the time periods is,
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