\(\text { Where } \overrightarrow{ r }=-2 \hat{ i }+3 \hat{ j }\)
\(\tau=(-2 \hat{ i }+3 \hat{ j }) \times(- Pk )\)
\(= P (-2 \hat{ j }-3 \hat{ i })= P (-3 \hat{ i }-2 \hat{ j })\)
\(\Rightarrow \text { So } a =-3, b =-2\)
\(\frac{ a }{ b }=\frac{3}{2}\)