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A non-planer loop of conducting wire carrying a current \( \mathrm{I} \) is placed as shown in the figure. Each of the straight sections of the loop is of length \( 2 a \). The magnetic field due to this loop at the point \( \mathrm{P}(\mathrm{a}, 0, \mathrm{a}) \) points in the direction.
(A) \( \frac{1}{\sqrt{2}}(-\hat{j}+\hat{k}) \)
(B) \( \frac{1}{\sqrt{3}}(-\hat{j}+\hat{k}+\hat{i}) \)
(C) \( \frac{1}{\sqrt{3}}(\hat{i}+\hat{j}+\hat{k}) \)
(D) \( \frac{1}{\sqrt{2}}(\hat{i}+\hat{k}) \)
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