Discussion
The angle of friction is the maximum angle between:
Answer: B
The angle of friction is the angle between the normal reaction and the resultant reaction.
When a body is on the point of sliding, the limiting friction F and the normal reaction R combine into a resultant reaction S. The angle \(\phi\) that S makes with R is the angle of friction, and \(\tan\phi = F/R = \mu\).
The friction force and the normal reaction are always at right angles, so A and C describe a fixed 90 degree angle, not the angle of friction. Option D measures from the wrong line.
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