A governor is said to be stable, if the

A governor is said to be stable, if the Correct Answer radius of rotation of balls increases as the equilibrium speed increases

A governor is said to be stable when for every speed within the working range there is a definite configuration i.e. there is only one radius of rotation of the governor balls at which the governor is in equilibrium. For a stable governor, if the equilibrium speed increases, the radius of governor balls must also increase.
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