Assertion (A): In ECM, the shape of the cavity is the mirror image of the tool, but unlike EDM, the tool wear in ECM is less.
Reason (R): The tool in ECM is a cathode.
Option (A)
Both A & R are true & R is the correct explanation of A
Option (B)
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
Correct Option:
Question Solution:
The tool of ECM is cathode, and workpiece as an anode. The tool wear is very less. The deposition of metal take place from anode to cathode.