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A magnetic field induction is changing i...

A magnetic field induction is changing in magnitude at a constant rate `dB//dt` . A given mass `m` of copper is drawn into a wire of radius `alpha` and formed into a loop of radius `r` is placed perpendicular to the field. Show that induced current in the loop is given by `i=(m)/(4pipdelta)(dB)/(dt)`
`p` : resistivity, `delta` : density of copper.

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