10. A point charge o is placed at as shown in the figure,
o
P
Is V-Vove or -ve when I 0. (11) ? Justify your answer.
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Explanation:
Answer
V=
4πϵ
o
r
q
=
r
kq
where k=
4πϵ
o
1
V
P
=
OP
kq
And V
Q
=
OQ
kq
⟹V
P
−V
Q
=kq
OP.OQ
OQ−OP
Since, OQ>OP
Hence,
OQ.OP
OQ−OP
>0
Hence V
P
−V
Q
>0 if q>0
And, V
P
−V
Q
<0 if q<0
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