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

A block of mass m is placed on a smooth inclined plane of inclination `theta` with the horizontal. The force exerted by the plane on the block has a magnitude

` mg sec theta`

`mg cos theta`

` mg sin theta`

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The correct Answer is:

(d) Angle of plane is just equal to the angle of repose.
or `" " mu =tan theta`

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