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Question

Two very long, straight, and insulated wires are kept at 90° angle from each other in xyplane as shown in figure.


These wires carry currents of equal magnitude I, whose directions are shown in the figure. The net magnetic field at point P will be:

A
+μ0Iπd(^z)
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B
μ0I2πd(^x+^y)
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C
Zero
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D
μ0I2πd(^x+^y)
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Solution

The correct option is C Zero
Let B1 and B2 are magnitudes of magnetic fields at point P due to the conductors along X and Y axes, respectively.

B1=μ0I2πd (^k)

And, B2=μ0I2πd (^k)

The net magnetic field at P is,

B=B1+B2

B=μ0I2πd(^k+(^k))=0

Hence, (A) is the correct answer.

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