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  4. A closed-loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS,SR and RQ are F1,F2 and F3 respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-je2ltvthbyitxpc7.jpg />

Q. A closed-loop carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments and are and respectively and are in the plane of the paper and along the directions shown, the force on the segment is
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Solution:

The net force on the current-carrying closed loop is zero.

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