"In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 $\times$ 10$-$2 A/m2 and moment of inertia 5 $\times$ 10$-$6 kg m2. If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take $\pi$2 as 9.85]"

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Accepted Answer

"$T = 2\pi \sqrt {{I \over {MB}}}$

B = 80 $\times$ 10^$-$4 = 8 mT"

In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 $\times$ 10^$-$2 A/m² and moment of inertia 5 $\times$ 10^$-$6 kg m². If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take $\pi$² as 9.85]

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In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 $\times$ 10$-$2 A/m2 and moment of inertia 5 $\times$ 10$-$6 kg m2. If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take $\pi$2 as 9.85]

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In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 $\times$ 10^$-$2 A/m² and moment of inertia 5 $\times$ 10^$-$6 kg m². If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take $\pi$² as 9.85]