In a electrochemical machining (ECM) operation, a square

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In a electrochemical machining (ECM) operation, a square hole of dimensions 5 mm × mm is drilled in a block of copper. The current used is 5000 A. Atomic weight of copper is 63 and valence of dissolution is 1. Faradays constant is 96500 coulomb. The material removal rate (g/s) is

1. 0.326
2. 3.26
3. 3.15 × 10³
4. 3.15 × 10⁵

Correct Option: B

MRR =	AI	kg/s.
	ZF

given:
A = 63
I = 5000 A
F = 96500 couloms.
Z = 1
So,

MRR =	63 × 5000	= 3.26 gm/s.
	96500 × 1