Two blocks A and B are kept on a table as shown in figure the number of forces acting on block A is

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Two blocks A and B of mass m A =1 kg and m B =3 kg are kept on the table as shown in figure. The coefficient of friction between A and B is 0.2 and between B and the surface of the table is also 0.2. The maximum force F in newtons that can be applied on B horizontally, so that the block A does not slide over the block B is [Take, .g =10 m / s 2]