b)two identical spheres having charges of opposite sign are placed 3m apart attract each other with a force 2.4*10^3N. Now spheres are touched and then placed on original separation repel with a force 10^-3N. Find initial charges on the sphere
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What was the first Chinese Civilisation?
Shang Dynasty — China's First Recorded History [ushistory.org]
The Shang dynasty
The Shang dynasty emerged in the 17th century B.C.E. as the first true Chinese dynasty. Its boundaries are shown in gray. To guard against flooding by the Yangtze and Yellow Rivers, the ancient Shang developed complex forms of irrigation and flood control.
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