The stress state at a point in a material under plane stress condition is equi-biaxial tension with a magnitude of $10\: MPa$. If one unit on the $\sigma -\tau$ plane is $1\: MPa$, the Mohr’s circle representation of the state-of-stress is given by

1.  a circle with a radius equal to principal stress and its center at the origin of the $\sigma -\tau$ plane
2. a point on the $\sigma$ axis at a distance of $10$ units from the origin
3. a circle with a radius of $10$ units on the $\sigma -\tau$ plane
4. a point on the $\tau$ axis at a distance of $10$ units from the origin