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If At is the gross area of steel in tension, d is the effective depth of the beam and y is the depth of the centre of gravity of the resultant compression, the moment of resistance M of the beam, is given by

M = At(d - y)
M = Atf(d - y)
M = Atf(d + y)
M =
none of these.

Correct Answer: M = Atf(d + y)

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