This is a subjective question, hence you have to write your answer in the Jext-Field given below. (a) Explain the reason wty abrasives are utilized in slurry form in ulitrasonic machining process (USM). [3] (b) An Engineer is machining Fe with Cu tool using Electro discharge machining process (EDM). Which polarity (direct polanity or reverse polarity) will you suggest him/her for machining? Explain the reason [3]