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A bar magnet of moment $\vec{M} = \hat{i} + \hat{j}$ is placed in a magnetic field induction $\vec{B} = 3 \hat{i} + 4 \hat{j} + 4 \hat{k}$ . The torque acting on the magnet is

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$4 \hat{i} - 4 \hat{j} + \hat{k}$

$\hat{i} + \hat{k}$

$\hat{i} + \hat{j} + \hat{k}$

$\hat{i} - \hat{j}$

answer is A.

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Detailed Solution

$\vec{τ} = \vec{M} \times \vec{B}$

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