Five balls numbered 1 to 5 are suspended using separate threads. Pairs (5,3), (3,4) and (4,5) show electrostatic attraction, while pairs (2,3) and (4,1) show repulsion. Therefore ball 5 must be?
(A) Positively Charged
(B)Negatively Charged
(C) Neutral
(D) Cannot be determined
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Explanation:since 2 and 3 and 4 and 1 are repealing and 4 and 5 are attracting, this means 2or 3 and 1 are similar charged (not 4 since it attracts 5).3 and 4 attracts so this proves that 2 and 1 are similar charge as 5.So this show that 5 is Negatively charged (b)
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