In the figure shown, horizontal force $F_1$ is applied on a block but the block does not slide. Then as the magnitude of vertical force $F_2$ is increased from zero the block begins to slide; the correct statement is

212694-q

  • A

    The magnitude of normal reaction on block increases

  • B

    Static frictional force acting on the block increases

  • C

    Maximum value of static frictional force decreases

  • D

    All of these

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A man balances himself in a horizontal position by pushing his hands and feet against two parallel walls. His centre of mass lies midway between the walls. The coefficients of friction at the walls are equal. Which of the following is not correct?