A magnet of total magnetic moment 10−2i^ Am2 is placed in a time varying magnetic fields, Bi^cos ωt where B=1 tesla and ω=0.125rad/s. The work done for reversing the direction of the magnetic moment at t=1 second, is

W=Ui−Uf=mBcos⁡0∘−[−mBcos⁡(0.125)]cos⁡70=1=mB+mBcos⁡70=2mB=2×10−2×1=0.02J

A magnet of total magnetic moment 10−2i^ Am2 is placed in a time varying magnetic fields, Bi^cos ωt where B=1 tesla and ω=0.125rad/s. The work done for reversing the direction of the magnetic moment at t=1 second, is

W=Ui−Uf=mBcos⁡0∘−[−mBcos⁡(0.125)]cos⁡70=1=mB+mBcos⁡70=2mB=2×10−2×1=0.02J

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A magnet of total magnetic moment $10^{- 2} \hat{i} {Am}^{2}$ is placed in a time varying magnetic fields, $B \hat{i} (\cos ωt)$ where B=1 tesla and $ω = 0 .125 rad / s .$ The work done for reversing the direction of the magnetic moment at t=1 second, is

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$\begin{array}{l} W = U_{i} - U_{f} = mBcos 0^{\circ} - [- mBcos (0 .125)] \\ \cos 7^{0} = 1 \end{array}$ $= mB + mBcos 7^{0} = 2 mB = 2 \times 10^{- 2} \times 1 = 0 .02 J$

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A magnet of total magnetic moment 10−2i^ Am2 is placed in a time varying magnetic fields, Bi^cos ωt where B=1 tesla and ω=0.125rad/s. The work done for reversing the direction of the magnetic moment at t=1 second, is

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A magnet of total magnetic moment $10^{- 2} \hat{i} {Am}^{2}$ is placed in a time varying magnetic fields, $B \hat{i} (\cos ωt)$ where B=1 tesla and $ω = 0 .125 rad / s .$ The work done for reversing the direction of the magnetic moment at t=1 second, is