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Electronics and Communication Electromagnetic Field Theory Difficulty: Medium

Two identical copper wires W 1 and W 2 placed in parallel as shown in the figure, carry currents I and 2I, respectively, in opposite directions. If the two wires are separated by a distance of 4r, then the magnitude of the magnetic field \[\overrightarrow B \] between the wires at a distance r from W 1 is

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