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A closed loop \( P Q R S \) carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments \( P S, S R \) and \( R Q \) are \( F_{1}, F_{2} \) and \( F_{3} \) respectively and are in the plane of the paper and along the directions shown, the force on the segment \( Q P \) is:
\( \mathrm{P} \)
W)
(a) \( F_{3}-F_{1}-F_{2} \)
(b) \( \sqrt{\left(F_{3}-F_{1}\right)^{2}+F_{2}^{2}} \)
(c) \( \sqrt{\left(F_{3}-F_{1}\right)^{2}-F_{2}^{2}} \)
(d) \( F_{3}-F_{1}+F_{2} \)
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