Published by:
CGP EDU Academic Team
Published on: August 23, 2026
A compass needle oscillates 20 times per minute at a place where the dip is 
and 30 times per minute where the dip is 
. The ratio of total magnetic field due to the earth at two place respectively is 
. The value of 
is
Text Solution
Verified by ExpertsThe correct answer is:
243
(243) Period of oscillation 
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