In figure, two long parallel wires carry equal currents in opposite directions. Point O is situated midway between the wires . X-Y plane contains the two wires and the Z-axis comes normally out of the plane of paper. P is a point such that the magnetic field B at P is zero . Then P lies
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a
Anywhere on YZ plane
b
Anywhere on X-axis
c
Anywhere on Y-axis
d
Anywhere on Z−axis
answer is C.
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Detailed Solution
Y axis lies midway between the wires and the magnetic fields produced by the wires, at any point on the Y axis , are equal in magnitude and oppositely directed.
In figure, two long parallel wires carry equal currents in opposite directions. Point O is situated midway between the wires . X-Y plane contains the two wires and the Z-axis comes normally out of the plane of paper. P is a point such that the magnetic field B at P is zero . Then P lies