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A copper wire ab of length l, resistance r and mass m start sliding at t=0 down a smooth, vertical, thick pair of connected conducting rails as shown in figure. A uniform magnetic field B exists in the space in a direction perpendicular to the plane of the rails which options are correct . A. The magnitude and direction of the induced current in the wire when speed of the wire v is `(vBl)/( r)`, a to bB. The downward acceleration of the wire at this instant `g-(B_(2)l^(2))/(mr)v`C. The velocity of the wire as a function of time `v_(m)(1-e^(-"gt"//v_(m))),("where" v_(m)=(mgr)/(B^(2)l^(2)))`D. The displacement of the wire as a function of time `v_(m)t-(v_(m)^(2))/(g)(1-e^(-"gt"//v_(m))),("where" v_(m)=(mgr)/(B^(2)l^(2)))` |
| Answer» Correct Answer - A::B::C::D | |