In the equation, \(\int_{L} \sigma^T \epsilon(\phi)Adx -\int_{L} \phi^T f Adx -\int_{L}\phi^Tdx – \sum_{i}\phi_i P_i=0\) First term represents _______
a) External virtual work
b) Virtual work
c) Internal virtual work
d) Total virtual work
Answer: c
Explanation: In the given equation first term represents internal virtual work. Virtual work means the work done by the virtual displacements. The principle of virtual work is equivalent to the conditions for static equilibrium of a rigid body expressed in terms of total forces and torques. The virtual work done by internal forces is called internal virtual work.
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