Two long straight wires are set parallel to each other. Each carries a – McqOptions

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1.	Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is [Kerala PET 2002; DCE 2002]
A.	\[{{\mu }_{o}}i/r\]
B.	\[4{{\mu }_{o}}i/r\]
C.	Zero
D.	\[{{\mu }_{o}}i/4r\]
Answer» D. \[{{\mu }_{o}}i/4r\]

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