A conducting ring of circular cross - se...

A conducting ring of circular cross - section with inner and outer radii a and b is made out of a material of resistivity `rho`. The thickness of the ring is h. It is placed coaxially in a vertical cylindrical region of a magnetic field `B=krt.` Where k is a positive constant, r is the distance from the axis and t is the time. If the current through the ring is `I=((kh)/(alphap))[b^(3)-a^(3)]` , then what is the value of `alpha`?

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