Question
Question: Charge Q, is divided into two parts which are then kept some distance apart. The force between them ...
Charge Q, is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are having the charge-
A
Q/2 each
B
Q/4 and 3Q/4
C
Q/3 and 2Q/3
D
E and (Q – e), where e = electronic charge
Answer
Q/2 each
Explanation
Solution
Let charges are q & (Q –q)
force F = 
= 
(qQ – q2)
For maximum force
= 0
\ 
[Q – 2q] = 0
\ 
\ Charge of other part
= Q – q
= Q –
= 