Q. The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r1 and r2 = External and internal radii of collar respectively)

• (A) 1 2 μW(r1+r2)
• (B) 2 3 μW(r1+r2)
• (C) 1 2 μW( r 3 1 −r 3 2 r 2 1 −r 2 2 )
• (D) 2 3 μW( r 3 1 −r 3 2 r 2 1 −r 2 2 )