Jus chek out careful when we have uniform electric charge distribution along wire or a sphere etc! Is there no any interaction between the charges in that uniform distribution! then look at the capacitor we only see straight field lines from positive charged plate to the negative charged plate are no more electric interaction that i expected ie. Between the adjacent charges on a plate or between two different charges in two different plates that are not connected by a straight horizontal field line! may any one help me out on what realy hapens?