Consider the circuit shown below where all resistors are of `1 k Omega`

If a current of magnitude 1 mA flows through the resistor marked X, what is the potential difference measured between point P and Q ?

Options

A. 21 V
B. 68 V
C. 55 V
D. 34 V

Answer

D

Explanation

Using KCL
At point A
`{:("Current is 3mA","At point C"),("Current is 8 mA","At point E"),("Current is 21 mA","At point G"),("Current through GH is 34 mA",):}`
`V_(PQ)=V_(GH)=i R_(GH)=34 V`
`V_(PQ)=V_(GH)=i R_(GH)=34 V`.