Question

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)?

	P	Q	R	S	T
a	+	-	+	0	+
b	+	-	+	+	0
c	-	+	-	0	0
d	+	-	+	0	0

Answer 1

Correct option: (d)