Five balls marked by numbers from 1 to 5 are hung by different threads. It is seen that the pairs of the balls (1,2), (2, 4), (4

Five balls marked by numbers from 1 to 5 are hung by different threads. It is seen that the pairs of the balls (1,2), (2, 4), (4,1) attract each other. Again the pairs (2,3) and (4,5) repel each other. So the ball marked by 1 is
A. positively charged
B. negatively charged
C. uncharged
D. made by a metal

Five balls marked by numbers from 1 to 5 are hung by different threads. It is seen that the pairs of the balls (1,2), (2, 4), (4,1) attract each other

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