Concrete Technology and Design of Concrete Structures
The critical section for finding maximum bending moment for footing under masonry wall is located

at the edge of the wall
at a distance equal to effective depth of footing from the edge of the wall
halfway between the middle and edge of the wall
at the middle of the wall

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

both forces of tension and compres-sion as well as lever arm change
forces of tension and compressions remain unchanged but lever arm changes with the moment
both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compression change but lever arm remains unchanged

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