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They first used the condition that the horizontal components of the tensions on the two wires add to zero because there is no translational motion.. They then calculated the sum of the torques about a point in the bar and set it to zero. They used the variable "d" to be the distance of the point from the left end of the bar. They were able from these considerations to get a value for d, which they then called the center of gravity. What confuses me is this. Shouldn't the net torque be zero about each and every point in the bar and not just the center of gravity?

Here is the video: