Which of the following is the correct expression which relates limiting friction (F), normal reaction (R) and coefficient of friction (μ)?
1
\(\frac{μ}{2}\) = \(\frac{R}{F}\)
2
\(\frac{1}{μ}\) = \(\frac{F}{R}\)
3
\(\frac{1}{μ}\) = \(\frac{R}{F}\)
4
\(\frac{R}{μ}\) = \(\frac{1}{F}\)