A current of \( i \) ampere is flowing through each of the bent wires as shown. The magnitude an....

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A current of \( i \) ampere is flowing through each of the
\( \mathrm{P} \)
bent wires as shown. The magnitude and direction of magnetic field at \( O \) is
W
(1) \( \frac{\mu_{0} i}{4}\left(\frac{1}{R}+\frac{2}{R^{\prime}}\right) \)
(2) \( \frac{\mu_{0} i}{4}\left(\frac{1}{R}+\frac{3}{R^{\prime}}\right) \)
(3) \( \frac{\mu_{0} i}{8}\left(\frac{1}{R}+\frac{3}{2 R^{\prime}}\right) \)
(4) \( \frac{\mu_{0} i}{8}\left(\frac{1}{R}+\frac{3}{R^{\prime}}\right) \)


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