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in JEE by (450 points)

Four infinitely long 'L' shaped wires, each carrying a current 'I' have been arranged as shown in the figure. Obtain the magnetic field intensity at the point 'O' equidistant from all the four corners.

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we know that

The net magnetic field due to wires from left to right and from right to left is zero as they cancel out. By applying right-hand thumb rule. As the left sides, magnetic field adds up and direction is upward whereas the right side magnetic field adds up to but direction is downward. so cancels up.

And for the wires from up to down or down to up, it is both the wires cancel its conjugate according to right hand thumb rule.
thus net magnetic field at pointis 0.

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