Question

In a Wheatstone bridge shown in figure (x = y) and A > B. The direction of the current between a and b will be :

• A. From a to b
• B. From b to a
• C. from a to b through c
• D. from b to a through c

Answer 1

The correct option is B From b to a

In a serially connected circuit, the distribution of voltage takes place in direct proportion to the resistance. So, drop across the resistance X is equal to the drop across the resistance Y. and, the drop across the resistance A is greater than the drop across the resistance B.
Now, the potential at the end of a resistor at which current leaves is equal to the potential at the end at which current enters the resistor subtracting the drop across the resistor. So, the potential at a is smaller than the potential at b. Current flows from a higher potential to lower potential. Hence, the direction of current is from b to a.