A current carrying loop is placed in a uniform magnetic field pointing in negative \( z \) direc...

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A current carrying loop is placed in a uniform magnetic field pointing in negative \( z \) direction. Branch \( P Q R S \) is a three quarter circle, while branch \( P S \) is straight. If force on branch \( P S \) is \( F \), force on branch \( P Q R \) is :
(a) \( \sqrt{2} F \)
(b) \( \frac{F}{\sqrt{2}} \)
(c) \( \frac{\pi F}{\sqrt{2}} \)
(d) \( \sqrt{2} \pi F \)
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