The figure shows a right-angled isosceles triangle \( P Q R \) of b...

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The figure shows a right-angled isosceles triangle \( P Q R \) of base equal to ' \( a \) ' metre. A current of \( I \) is flowing downwards along a thin straight wire cutting the plane of the paper normally at \( Q \). A similar wire carries an equal current flowing upwards at \( R \). Find the magnitude and the direction of the magnetic induction \( \vec{B} \) at \( P \). Assume the wires to be infinitely long. Given \( \mu_{o}=4 \pi \times 10^{-7} \mathrm{Tm} A^{-1} \).
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