A current \( I(=4 \mathrm{~A}) \) flows along a thin wire \( P Q R ...

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A current \( I(=4 \mathrm{~A}) \) flows along a thin wire \( P Q R S \) shaped as shown in Fig.

The radius of the curved part of the wire is \( 10.0 \mathrm{~cm} \). The angle \( \theta=90^{\circ} \). Find the magnitude of the total magnetic field at the point \( \mathrm{O} \).
\( \mathrm{P} \)
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