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Calculate torque acting on a bar magnet ...

Calculate torque acting on a bar magnet of length 20 cm magnetic dipole moment `4 xx 10^(-6) Am^(2)` , which is placed in earth's magnetic field of flux density ` 2 xx 10^(-5) T` , perpendicular to the field .

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`tau MB sin theta (sin 90^(@)=1) = 8 xx 10 ^(-11)Nm.`
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