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A solid circular beam with radius of $0.25$ m and length of $2$ m is subjected to a twisting moment of $20$ kNm about the z-axis at the free end, which is the only load acting as shown in the figure. The shear stress component $\tau_{xy}$ at point 'M' in the cross-section of the beam at a distance of $1$ m from the fixed end is

  1. $0.0$ MPa
  2. $0.51$ MPa
  3. $0.815$ MPa
  4. $2.0$ MPa
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