question_answer

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)            \[\frac{2{{i}_{1}}{{i}_{2}}}{r}N/m\]

Correct Answer: B

Solution :

                   As shown in the following figure straight wire is placed parallel to the magnetic field produced by circular current. Hence force on wire F = 0