a) ε(ф)=\(\frac{dx}{d\phi}\)
b) ε(ф)=\(\frac{d\phi}{dx}\)
c) ε(ф)=\(\frac{dx}{d\varepsilon}\)
d) ф(ε)=\(\frac{d\varepsilon}{d\phi}\)
Answer: b
Explanation: Virtual work is defined as the work done by a real force acting through a virtual displacement. A virtual displacement is any displacement is any displacement consistent with the constraints of the structure.
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