WBJEE 2018 Physics Solved Paper

A block of mass m2 is placed on a horizontal table and another block of mass m1 is placed on top of it.An increasing horizontal force F = αt is exerted on the upper block but the lower block never moves asa result. If the co-efficient of friction between the blocks is µ1 and that between the lower block and thetable is µ2 , then what is the maximum possible value of

µ1

µ2

?