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A magnetic needle has magnetic moment of `6*7xx10^-2Am^2` and moment of inertial of `7*5xx10^-6kgm^2`. It perform `10` complete oscillations in `6*70s`. What is the magnitude of the magnetic field?

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Verified by Experts

The time period of oscillation is,
`T=(6.70)/(10)=0.67s`
From Eq. (5.5)
`B=(4pi^(3))/(mT^(2))` lt brgt `=(4xx(3.14)^(2)xx7.5xx10(-6))/(6.7xx10^(-2)xx(0.67)^(2))`
=0.01T
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