Two long conductors, separated by a distance r carry current I1 and I2 – McqOptions

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1.	Two long conductors, separated by a distance r carry current I₁ and I₂ in the same direction. They exert a force F on each other. Now, the current in one them is increased to 3 times and the direction is reversed. The distance is also increased to 5r. What is the new value of the force between them?
A.	( frac {3F}{5} )
B.	( frac {-3F}{5} )
C.	( frac {5F}{3} )
D.	( frac {-5F}{3} )
Answer» C. ( frac {5F}{3} )

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