During the electrochemical machining $(ECM)$ of iron (atomic weight $= 56$, valency $= 2$) at current of $1000$ $A$ with $90\%$ current efficiency, the material removal rate was observed to be $0.26 gm/s$. If Titanium (atomic weight $= 48$, valency $= 3$) is machined by the $ECM$ process at the current of $2000 A$ with $90\%$ current efficiency, the expected material removal rate in $gm/s$ will be
- $0.11$
- $0.23$
- $0.30$
- $0.52$