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In Fg. 5.4 (b). The magnetic needle has ...

In Fg. 5.4 (b). The magnetic needle has magnetic moment `6.7xx10^(-2)Am^(2)` and moment of inertia `=7.5 xx 10^(-6)kg m^(2)`. It performs 10 complete oscillations is 6.70 s. what is the magnitude of the magnetic field?

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