Two thin long wires carry currents I1 and I2 along x-and y-axes respectively as shown in figure. Consider the points only in x-y plane.
A
Magnetic field is zero at least at one point in each quadrant
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B
Magnetic field can be zero somewhere in the first quadrant
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C
Magnetic field can be zero somewhere in the second quadrant
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D
Magnetic field is non-zero in second quadrant
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Solution
The correct options are B Magnetic field can be zero somewhere in the first quadrant D Magnetic field is non-zero in second quadrant In first and third quadrants, direction of magnetic field is opposite due to the two wires.
So, magnetic field can be zero only in first and third quadrants not in second and fourth.