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A uniform field of induction B is changi...

A uniform field of induction `B` is changing in magnitude at a constant rate `dB//dt`.You are given a mass `m` of copper which is to be drawn into a wire of radius `r` `&` formed into a circular loop of radius `R`.Show that the induced current in the loop does not depend on the size of the wire or of the loop.Assuming `B` perpendcular to the loop prove that the induced current `i=m/(4pirho delta)(dB)/(dt)` where `rho` is the resistivity and `delta` the density of copper.

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