A conducting light string is wound on the rim of a metal

Last updated: 6/9/2023

A conducting light string is wound on the rim of a metal ring of radius r and mass m The free end of the string is fixed to the ceiling A vertical infinite conducting smooth plane is always tangent to the ring The ring is released in a uniform magnetic field of strength B perpendicular to the plane of the ring The string and the plane are connected by a resistance R The ring is always immersed in the magnetic field The terminal velocity of the ring is plane