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  4. A circular coil PQRSP is placed in a uniform magnetic field. When a current flows through the coil, the force on the segment PQ is F. The force on the remaining segment QRSP is

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Q. A circular coil PQRSP is placed in a uniform magnetic field. When a current flows through the coil, the force on the segment PQ is F. The force on the remaining segment QRSP isPhysics Question Image

Rajasthan PMTRajasthan PMT 2011

Solution:

A circular coil $ PQRSP $ is placed in a uniform magnetic field. When a current flows through the coil, the force on segment $ PQ $ is $ \mathbf{F} $ then the force on the remaining segment $ QRSP $ is $ -\mathbf{F} $ . Aliter $ \because $ $ {{F}_{\operatorname{close}\,\,loop}}=0 $ $ {{\mathbf{F}}_{PQ}}+{{\mathbf{F}}_{QRSP}}=0 $ $ {{\mathbf{F}}_{QRSP}}=-\mathbf{F} $