A) potential difference between them.
B) mutual inductance between them.
C) electric force between them.
D) magnetic force between them.
Correct Answer: D
Solution :
Fact: Fleming's left hand rule. As shown in the given figure, let the conductor Y carry currents \[{{i}_{2}}\] situated in a magnetic field \[\vec{B}\]perpendicular to its length. It therefore experiences a magnetic force, the magnitude of the force acting on a length l of Y is:
\[F={{i}_{2}}\,Bl={{i}_{2}}\left( \frac{{{\mu }_{0}}}{2\pi }.\frac{{{i}_{1}}}{R} \right)l.\] From Fleming's left hand rule the direction of this force is towards X. Similarily, force per unit length of X due to Y is directed opposite to Y. Hence, the conductors attract each other.
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