$A$ block of mass $m$ is kept on a wedge of mass $M$,as shown in the figure,such that mass $m$ remains stationary with respect to the wedge. The magnitude of force $P$ is

  • A
    $g \tan \beta$
  • B
    $m g \tan \beta$
  • C
    $(M+m) g \tan \beta$
  • D
    $m g \cot \beta$

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