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Q. In the adjoining figure the potential difference between the points $A$ and $B$ will be -Physics Question Image

Solution:

If $I$ is current through $ABC$
$I =\frac{5}{21}, V _{ AB }= I \times(7+7)$
$V _{ AB }=\frac{5}{21} \times 14=\frac{10}{3}$ Volt