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     EduGorilla 
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    The surface irregularities of electrodes used in an electrochemical machining (ECM) process are 3 μm and 6 μm as shown in the figure. If the work-piece is of pure iron and 12V DC is applied between the electrodes, the largest feed rate is mm/min.

    Assume the iron to be dissolved as Fe+2 and the Faraday constant to be 96500 Coulomb.

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