[A] equal to angle of repose
[B] equal to twice the angle of repose
[C] is greater than the angle of repose
[D] is less than the angle of repos
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The correct answer is [A] equal to angle of repose.
The angle of repose is defined as the angle of inclination of a plane with the horizontal, such that an object placed on it just begins to slide.
When the angle of friction becomes equal to the angle of repose, it is known as ‘limiting friction’ or ‘critical angle’.
Thus, the angle of friction is equal to the angle of repose.