A semi circular current carrying wire having radius R is placed in x-y plane with its centre at origin ‘O’. There is non-uniform magnetic field$\overrightarrow{B}=\frac{{\text{B}}_{\text{0}}x}{2\text{R}}\hat{k}$  (here ${\text{B}}_{\text{0}}$ is $+\text{ve}$ constant) is existing in the region. The magnetic force acting on semi circular wire will be along