Strength of Materials
The necessary condition for forces to be in equilibrium is that these should be

Coplanar & Meet at one point
Meet at one point
Coplanar
All be equal

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
Different at different points in its line of action
Minimum when it acts at the C.G. of the body
The same at every point in its line of action

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