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In Fig (b) , the magnetic needle has mag...

In Fig (b) , the magnetic needle has magnetic moment `6.7 xx10^(-2) "Am"^2` and moment of inertia `I=7.5xx10^(-6)"kgm"^2` . It performs 10 complete oscillations in 6.70s. What is the magnitude of the magnetic field ?

Text Solution

Verified by Experts

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