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A block of mass m is placed on a smooth ...

A block of mass m is placed on a smooth inclined wedge ABC of inclination `theta` as shown in the figure. The wedge is given an acceleration a towards the right. The relation between a and `theta` for the block to remain stationary on the wedge is

A

a = g cos `theta`

B

a = `(g)/(sin theta)`

C

a = `(g)/(cosec theta)`

D

`a = g tan theta `

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