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JEE Main2015PhysicsLaws of MotionActual

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 and kept in equilibrium 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:

Options

  1. A150   N
  2. B100   N
  3. C80   N
  4. D120   N

Correct answer

D. 120   N

Step-by-step solution

For complete state equilibrium of the system. The state friction on the block B by the wall will balance the total weight 120   N of the system.

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