Answer
$\tau = 3.0~N\cdot m$
Work Step by Step
We can find the magnitude of the torque on the particle about the origin:
$\tau = r \times F$
$\tau = r F~sin~\theta_3$
$\tau = (3.0~m)(2.0~N)~sin~30^{\circ}$
$\tau = 3.0~N\cdot m$
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