Vikas TU
Last Activity: 4 Years ago
Dear student
The above ans is incorrect , Please follow this
Let q1 = qand q2 = Q-q
r be the distance or separation between them
The force of repusion between them is
F = k (Q-q)q/r^2
Differenciating F with respect to q and setting it to zero will give us extreme force.
dF/dq = 0
so, q/Q = 1/2
For this value q/Q the force is maximum .
The force will be maximum if the second derivative of F is less than 0
d^2F /dq^2= -2k/r^2 which is less than 0.
Thus the force of repulsion is maximum when q=Q/2
so , q1 = Q/2 an q2 = Q/2
Hope this helps