Answer
The answer is given below.
Work Step by Step
The body is in equilibrium when the net external force & torque on it are both zero.
(1)$\space \sum\vec F_{i}=0$ ; The net external force on a system must be zero.
(2)$\space \sum \vec \tau_{i}=\sum(\vec r_{i}\times\vec F_{i})=0$ ; The net external torque must also be zero.
