Q3. Mohr's circle for the state of stress defined by \beginbmatrix 30 & 0 \ 0 & 30 \endbmatrix Mpa is a circle with
- (a) center at (0, 0) and radius 30 Mpa
- (b) center at (0, 0) and radius 60 Mpa
- (c) center at (30, 0) and radius 30 Mpa
- (d) center at (30, 0) and zero radius