Cutting tool is much harder than the work piece. Yet the tool wears out during the tool- work interaction, because (a) extra hardness is imparted to the work piece due to coolant used (b) oxide layers formed on the work piece surface impart extra hardness to it (c) extra hardness is imparted to the work piece due to severe rate of strain (d) vibration is induced in the machine tool .
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Explanation:
Correct option is c
When extra force is applied on the hard object it gets wear out.
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