A 220 mh toroidal solenoid has an average radius of 560, Ask an Expert

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A 2.20 mH toroidal solenoid has an average radius of 5.60 centimeter and a cross-sectional area of 2 cm².

A) Compute how many coils does it have? In calculating the flux, assume that B is uniform across a cross section; ignore the variation of B with distance from the toroidal axis.

B) Find at what rate must the current through it change so that a potential difference of 2.80 V is developed across its ends?

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