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(D) The circuit represents a balanced Wheatstone bridge configuration.In a balanced Wheatstone bridge,the ratio of resistances in opposite arms is equ

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(D) The circuit represents a balanced Wheatstone bridge configuration.In a balanced Wheatstone bridge,the ratio of resistances in opposite arms is equal,which means no current flows through the central galvanometer or resistor connected between points $A$ and $B$.Since no current flows through the branch between $A$ and $B$,the potential at point $A$ is equal to the potential at point $B$.Therefore,the potential difference $V_B - V_A = 0 \ V$.

Potential difference between $A$ and $B$ is .............. $V$.

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