join A 2.80 mH toroidal solenoid has an average radius of 5.40 cm and a cross-sectional area of {\:}2.20 cm^2 . A. Fun
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How many coils does it have? In calculating the flux, assume that B is uniform across a cross section, neglect the variation of B with distance from the toroidal axis B. At what rate must the current through it change so that a potential difference of 2.40 V is developed across its ends?
