"A bar magnet having a magnetic moment of 2.0 $\times$ 105 JT$-$1, is placed along the direction of uniform magnetic field of magnitude B = 14 $\times$ 10$-$5 T. The work done in rotating the magnet slowly through 60$^\circ$ from the direction of field is :"

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Accepted Answer

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$U = - \overrightarrow M \,.\,\overrightarrow B$

So ${U_f} - {U_i} = - MB(1 - \cos \theta )$

$= - 14J$

So $W = - \Delta U = 14J$

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A bar magnet having a magnetic moment of 2.0 $\times$ 10⁵ JT^$-$1, is placed along the direction of uniform magnetic field of magnitude B = 14 $\times$ 10^$-$5 T. The work done in rotating the magnet slowly through 60$^\circ$ from the direction of field is :

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A bar magnet having a magnetic moment of 2.0 $\times$ 105 JT$-$1, is placed along the direction of uniform magnetic field of magnitude B = 14 $\times$ 10$-$5 T. The work done in rotating the magnet slowly through 60$^\circ$ from the direction of field is :

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A bar magnet having a magnetic moment of 2.0 $\times$ 10⁵ JT^$-$1, is placed along the direction of uniform magnetic field of magnitude B = 14 $\times$ 10^$-$5 T. The work done in rotating the magnet slowly through 60$^\circ$ from the direction of field is :