In the case of flat collar pivot bearing, the frictional force in case of uniform wear can be assumed to be acting at
1
\((\frac{{2}}{{3}})~\times~(\frac{{r_1^2~-~r_2^2}}{{r_1~-~r_2}})\)
2
\((\frac{{1}}{{2}})~\times~(\frac{{r_1~+~r_2}}{{2}})\)
3
\((\frac{{2}}{{3}})~\times~(\frac{{r_1^3~-~r_2^3}}{{r_1^2~-~r_2^2}})\)
4
\((\frac{{1}}{{2}})~\times~(r_1~+~r_2)\)
5
Question Not Attempted