question_answer

In the circuit shown in the figure. If the potential at point A is taken to be 0, the potential at point B is

A)      \[-1V\]                         

B) \[+2V\]                       

C)               \[-2V\]                         

D) +1V

Correct Answer: D

Solution :

As shown in the figure, current from C to D = 1A                     (i) \[{{V}_{C}}-{{V}_{D}}=2\times 1=2V\] As, \[{{V}_{A}}=0,\]therefore, \[{{V}_{D}}=1V\] From (i), \[{{V}_{C}}-1=2\]or \[{{V}_{C}}=3V\] Here,\[{{V}_{C}}-{{V}_{B}}=2\]or \[3-{{V}_{B}}=2\] or \[{{V}_{B}}=3-2=1V.\] Hence, the correction option is [d].