Question

Five polyester balls labelled
P
,
Q
,
R
,
S
and
T
are suspended from insulating threads. Several experiments are performed on the balls and the following observations are made.
(
1
)
Ball
P
repels
R
and attracts
Q
.
(
2
)
Ball
S
attracts
Q
and has no effect on
T
.
(
3
)
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 (zero refers to uncharged)?

P
–
positive,
Q
–
negative,
R
–
positive,
S
–
zero,
T
–
positive
P
–
positive,
Q
–
negative,
R
–
positive,
S
–
positive,
T
–
zero
P
–
negative,
Q
–
positive,
R
–
negative,
S
–
zero,
T
–
zero
P
–
positive,
Q
–
negative,
R
–
positive,
S
–
zero,
T
–
zero
​

Answer 1

Answer:

zero positive zero

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