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Two very long, straight, and insulated wires are kept at 90° angle from each other in xy- plane as shown in the figure I d y d I x P These wires carry currents of equal magnitude I, whose directions are shown in the figure. The net magnetic field at point P will be -

1. Zero
2. ) y ˆ x ˆ ( d 2 I 0 + π μ −
3. ) y ˆ x ˆ ( d 2 I 0 + π μ
4. ) z ˆ ( d I 0 π μ +

Correct answer: Zero

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