A metallicring of mass m and radius 1 is falling under gravity in a region having a magnetic field.if z is the vertical direction,the z component of magnetic field is Bz=B0(1+uz).if the ring falls with a constant velocity,use the conservation of energy lost in the resistance.if the ring has reached a constant velocity,use the conservation of energy to determine v in terms of m, b,u and acceleration due to gravity g,

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