Question
Question: Three charges –q, Q and –q are placed at equal distances on a straight line. If the potential energy...
Three charges –q, Q and –q are placed at equal distances on a straight line. If the potential energy of the system of three charges is zero, then what is the ratio of Q : q?
A
1 : 1
B
1 : 2
C
1 : 3
D
1 : 4
Answer
1 : 2
Explanation
Solution
Ex = –
= –
(10axy) 
= – 10ay
Ey = 
= –
(10axy) 
= – 10ax
E = – 10a (y
+ x
)