Two fixed charges +4q and +q are placed at a distance 'r' apart, At what point between them a charge +q be placed so that it is in equilibrium?

Question

souvik · Answer

the net force on the +q charge which is placed between the two other charges will be zero...use coulomb's law..

binary3i · Answer

let distance between +4q(A) and equilibrium(C) be x.
so distance between +q(B) and equilibrium(C) will be (r-x)
|dw:1372771306942:dw|
equilibrium means all the forces on the C should be zero.|dw:1372771484769:dw|
so can you do it now.

anonymous · Answer

Can we place the +q charge inside a +4q charge? Is there any mistake in the question or I have to do it ?