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  4. An elastic circular wire of length l carries a current 1. It is placed in a uniform magnetic field B (out of paper) such that its plane is perpendicular to the direction of B. The wire will experience

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Q. An elastic circular wire of length $ l $ carries a current 1. It is placed in a uniform magnetic field B (out of paper) such that its plane is perpendicular to the direction of B. The wire will experiencePhysics Question Image

CMC MedicalCMC Medical 2013

Solution:

Angle between normal to plane and B is $ 90{}^\circ $ . Because plane of circular wire is perpendicular to B. $ F=Bil\,\sin \theta $ $ =Bil\,\sin \theta $ $ =0 $