Electrochemical machining is performed to remove material from an iron surface of 20 mm x 20 mm under the following conditions: Inter electrode gap 0.2mm = 0.2 mm Supply voltage DC 12 V = 12 V Specific resistance of electrolyte = 2 $\Omega$cm Atomic weight of Iron = 55.85 Valency of Iron = 2 Faraday 's constant = 96540 coulombs The material removal rate (in g/s) is