A bar magnet having a magnetic moment of `2xx10^(4) JT^(-1)` is free to rotate in a horizontal plane. A horizontal magnetic field `B=6xx10^(-4)T` exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction `60^(@)` from the field isA. 2JB. 0.6JC. 12JD. 6J

A bar magnet having a magnetic moment of `2xx10^(4) JT^(-1)` is free t

1.	A bar magnet having a magnetic moment of `2xx10^(4) JT^(-1)` is free to rotate in a horizontal plane. A horizontal magnetic field `B=6xx10^(-4)T` exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction `60^(@)` from the field isA. 2JB. 0.6JC. 12JD. 6J
Answer» Correct Answer - D `W=MB(cos theta_(1)-cos theta _(2))` `= 2 xx 10^(4) xx 6xx 10^(-4)( cos theta - cos 60^(@))` `=12xx(1)/(2)=6J`

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