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asked in Olympiad by (70.6k points)

Five polyester balls labeled P, Q, R, S & T are suspended from insulating threads. Several experiments are performed on the balls and the following observations are made. 

I. Ball P repels R and attracts Q 

II. Ball S attracts Q and has no effect on T 

III. A negatively charged rod attracts both P and T 

Which one of the following options correctly describes the nature of charges on the respective balls (0 refers to uncharged)?

PQRST
a+-+0+
b+-++0
c-+-00
d+-+00

1 Answer

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Correct option: (d)

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