Assertion $A$ : In a Mohr's circle, the vertical coordinates of the ends of any diameter are equal in magnitude and opposite in direction.

Reason $R$ : The shear stresses on two planes at right angles are equal in magnitude and tend to rotate the element in opposite directions.

- 1
  
  Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
- 2
  
  Both $A$ and $R$ are true but $R$ is not a correct explanation of $A$
- 3
  
  $A$ is true but $R$ is false
- 4
  
  $A$ is false but $R$ is true

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