Question

Electro-chemical machining is performed on a flat copper workpiece. If the material removal rate is $2\ cm^3/min$ throughout the process, then the required current (in A) is ______ . (Rounded off to 1 decimal place)
Copper properties: Melting point = $1085 °C$, density = $9\ g/cm^3$, gram atomic weight = $63$, and valency of dissolution = $2$
Faraday's constant = $96500 C$
Stefan-Boltzmann constant = $5.67 \times 10^{-8} W/m^2-K^4$

Answer 1

The answer is: 915.0 or 925.0 (approx.)