question_answer

There uncharged capacitors of capacitance \[1\mu f,\,2\mu f\]and \[3\mu f\] are connected shown in figure. If potentials at point, P,Q and R are IV, 2V, 3V respectively, then, potential at Q is:             

A)  \[\frac{18}{11}\,V\]                   

B)  \[\frac{11}{18}\,V\]

C)  \[5\,V\]                       

D)  None of these

Correct Answer: D

Solution :

From KCL, \[1(V-1)+2(V-2)+3(V-3)=0\] (Here V= Potential point m)             \[V=\frac{7}{3}\] Volt             (Note that the net change on the plates connected to the M is zero.)