Answer
The magnitude of the torque is $~4.0~N\cdot m$
Work Step by Step
In general, the torque is $\tau = r\times F$, where $r$ is the smallest distance between the force vector and the axis, and $F$ is the perpendicular component of the force vector.
We can find the magnitude of the torque:
$\tau = r\times F$
$\tau = (0.16~m)(25~N)$
$\tau = 4.0~N\cdot m$
The magnitude of the torque is $~4.0~N\cdot m$
