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 F 1 , F 2 and F 3 respectively and are in the plane of the paper

Question

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 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 QP is not equal to -

TestHub · Accepted Answer

The net force on a closed current loop in a uniform magnetic field is zero.

$F_{QP} = - (F_{1} + F_{2} + F_{3})$

With $F_{1}, F_{3}$ along one line and $F_{2}$ perpendicular to them,

$∣ F_{QP} ∣ = (F_{3} - F_{1})^{2} + F_{2}^{2}$

So the force equals only option (D); it is not equal to (A), (B) or (C).

Physics - Magnetism Question with Solution | TestHub

Options:(select one or more)

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