The angle of dip at a place is 
. A magnetic needle oscillates in a horizontal plane at this place with period T. The same needle will oscillate in a vertical plane coinciding with the magnetic meridian with a period
A
T
B
2 T
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
When needle oscillates in horizontal plane
Then it's time period is 
.(i)
When needle oscillates in vertical plane i.e. It oscillates in total earth's total magnetic field
Hence 
……(ii)
Dividing equation (ii) by (i)
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