JEE Main & Advanced
JEE Main Paper (Held On 11 April 2015)
question_answer
In the electric network shown, when no current flows through the \[4\Omega \]resistor in the arm EB, the potential difference between the points A and D will be:
[JEE Main Online Paper (Held On 11 April 2015)]
A) 3V
B) 4V
C) 5V
D) 6V
Correct Answer:
C
Solution :
If current in \[4\Omega \] is zero then \[\underset{BCDE}{\mathop{{{\varepsilon }_{v}}}}\,=0\] \[{{V}_{EB}}+{{V}_{BC}}+{{V}_{CD}}+{{V}_{DE}}=0\] \[-4+3+{{V}_{CD}}+0=0\] \[{{V}_{CD}}=1\]volt again \[{{V}_{A}}-9+3+1-{{V}_{D}}=0\] \[{{V}_{A}}-{{V}_{D}}=5V\]