Given in the figure are two blocks A and B of weight 20 N and 100 N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is :
← JEE Main 2015 · 4 Apr · Shift 1
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JEE Main 2015 · 4 Apr · Shift 1, Physics question 3
Answer and worked solution
Official answer: C
Vertically, the wall's friction on B must support the weight of both blocks: A's 20 N weight passes to B through friction between the blocks, and B's own weight is 100 N. In equilibrium