Find the magnitude of torque of a force `vec F = )-3 hat i+ hat j +5 hat k)`. Newton acting at the point `vec r =(7 hat j+3 hat j +hat k) metre`.

Explanation

To find the magnitude of the torque \(\vec{\tau}\) produced by a force \(\vec{F}\) acting at a point defined by the position vector \(\vec{r}\), we use the formula:

\[ \vec{\tau} = \vec{r} \times \vec{F} \]

### Step 1: Identify the vectors
Given:
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