A uniform ladder is positioned as shown for the purpose of maintaining the light fixture suspended from

the cathedral ceiling. Determine the minimum coefficient of static friction required at ends A and $B$ to

prevent slipping. Assume that the coefficient is the same at A and $B.$

$0\mathrm{.}432$

$0\mathrm{.}543$

$0\mathrm{.}321$

$0\mathrm{.}654$