A straight wire carrying a current \[{{i}_{1}}\,amp\] runs along the axis of a circular current \[{{i}_{2}}\,amp\]. Then the force of interaction between the two current carrying conductors is

• A.            \[\infty \]                              
• B.            Zero
• C.            \[\frac{{{\mu }_{0}}}{4\pi }\frac{2{{i}_{1}}{{i}_{2}}}{r}N/m\]             
• D.            \[\frac{2{{i}_{1}}{{i}_{2}}}{r}N/m\]