A) \[\operatorname{T}=\sqrt{\frac{I}{MB}}\]
B) \[\operatorname{T}=2\pi \sqrt{\frac{\operatorname{I}}{MB}}\]
C) \[\operatorname{T}=2\pi \sqrt{\frac{MB}{\operatorname{I}}}\]
D) \[\operatorname{T}=\pi \sqrt{\frac{MB}{\operatorname{I}}}\]
Correct Answer: B
Solution :
Option [b] is correct. Explanation: Time period of oscillation of a magnetic needle is \[\operatorname{T}=2\pi \sqrt{\frac{\operatorname{I}}{MB}}\]
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