Magnetic Field of Straight Wires
Two long straight parallel wires are separated by a distance of cm. Each wire carries current mA in the same direction. The magnetic field at a point P midway between them is permeability of free space
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Answer: (d)
- For currents in the same direction, the two fields at the midpoint are opposite.
- Equal currents at equal distances give equal magnitudes, so they cancel.
- So the answer is (d) zero.