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A magnetic needle has a magnetic moment ...

A magnetic needle has a magnetic moment `5.0xx10^(-2)" A "m^(2)` and moment of inertia of `7.8xx10^(-6)"kg m"^(2)` , it performs 12 complete oscillations in 6.0 s. What is the magnitude of magnetic field ?

Text Solution

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The time period of oscillation is `T = 6.70/100 = 0.067s`
`B=4pi^(2)I/mT^(2)=4xx(3.14)^(2)xx7.5xx10^(-6)/6.7xx10^(-2)xx(0.067)^(2)=0.0001 T`
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