Two identical ladders are arranged as sh...

Two identical ladders are arranged as shown in the figure. Mass of the block is m and the mass of each ladder is M. The length of each of the ladder is L. The system is in equilibrium. What is the magnitude of frictional force acting at A or B?

`(mg)/(2)cos theta`

`(Mg)/(2) cos theta`

`((M-m))/(2)g cos theta`

`((M+m)/(2))g cot theta`

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