All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2010 Physics

Q. 8. Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper as shown. The variation of the magnetic field B along the line XX’ is given by

Sol:

As the direction and magnitude of current is same in both the wires B is zero at mid of line joining wire 1 and 2
Just right of wire 1, B > 0
Just left of wire 1, B < 0
Just right of wire 2, B > 0
Just left of wire 2, B < 0

Answer : (1)