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  4. Two equal electric currents are flowing perpendicular to each other as shown in the figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the currents. Where do we expect the resultant magnetic field to be zero? <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/ae60b2162a83719280a740b2d9e96942-.jpeg />

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Q. Two equal electric currents are flowing perpendicular to each other as shown in the figure. $AB$ and $CD$ are perpendicular to each other and symmetrically placed with respect to the currents. Where do we expect the resultant magnetic field to be zero?
image

AIPMTAIPMT 1996Moving Charges and Magnetism

Solution:

The direction of the magnetic field, due to current, is given by the right-hand rule. At axis $AB$, the components of magnetic field will cancel each other and the resultant magnetic field will be zero.