A bar magnet of magnetic moment $$104J/T$$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $$4$$ $$x10-5$$ T to a direction $$600$$ from the field will be

Question

A bar magnet of magnetic moment $$104J/T$$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $$4$$ $$x10-5$$ T to a direction $$600$$ from the field will be

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Magnetic moment of bar,  $$M=104$$ $$J/THence$$, work done, $$W=MB($$$$cos$$ $$0$$ $$-$$ $$cos$$ $$60)$$                                    $$=$$ $$MB2$$                                   $$=104$$ x $$4$$ x $$l0-5$$ x $$cos60o$$ $$=$$ $$0.2$$ J

A bar magnet of magnetic moment $10^{4} J / T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $4 x 10^{- 5} T$ to a direction $60^{0}$ from the field will be

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A bar magnet of magnetic moment 104J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4 x10-5 T to a direction 600 from the field will be

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Ready to Test Your Skills?

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A bar magnet of magnetic moment $10^{4} J / T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $4 x 10^{- 5} T$ to a direction $60^{0}$ from the field will be