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A body of mass m is kept on a rough fixe...

A body of mass `m` is kept on a rough fixed inclined plane of angle of inclination `theta=30^(@)`. It remains stationary. Then magnitude of force acting on the body by the inclined plane is equal to `:`

A

`mg`

B

`mg sin theta`

C

`mg cos theta`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
`N=mgcos theta, f_(s)=mg sin theta`
`R^(2)=N^(2)+f_(s)^(2)`
`rArrR=mg ` `(A)`.
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