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An infinitely long conductor \( P Q R \) is bent to form a right angle as shown. A current \( I \) flows through \( P Q R \). The magnetic field due to this current at the point \( M \) is \( H_{1} \). Now, another infinitely long straight - conductor \( Q S \) is connected at \( Q \), so that the current is \( 1 / 2 \) in \( Q R \) as well as in \( Q S \). The current in \( P Q \) remaining unchanged. The magnetic field at \( M \) is now \( \mathrm{H}_{2} \). The ratio \( \mathrm{H}_{1} / \mathrm{H}_{2} \) is given by
(a) \( \frac{1}{2} \)
(b) 1
(c) \( \frac{2}{3} \)
(d) 2
\( \mathrm{P} \)
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