The magnetic needle has magnetic moment \[8.7\times {{10}^{-2}}\,A{{m} – McqOptions

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1.	The magnetic needle has magnetic moment \[8.7\times {{10}^{-2}}\,A{{m}^{2}}\] and moment of inertia\[11.5\times {{10}^{-6}}\,kg{{m}^{2}}\]. It performs 10 complete oscillations in 6.70 s, what is the magnitude of the magnetic field?
A.	0.012 T
B.	0.120 T
C.	1.200 T
D.	2.10 T
Answer» B. 0.120 T

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