A body of mass m is placed on a rough su...

A body of mass `m` is placed on a rough surface with coefficient of friction `mu` inclined at `theta`. If the mass is in equilibrium, then

`theta=tan^(-1) mu`

`theta=tan^(-1) 1/mu`

`theta=tan^(-1) m/mu`

`theta=tan^(-1) mu/m`

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