
The value of current I in the electrical circuit as given below, when potential at A is equal to the…

Solution

$\begin{aligned} & \mathrm{V}_{\mathrm{A}}=\mathrm{V}_{\mathrm{B}} \Rightarrow \text { the bridge is balanced } \\ & \Rightarrow \frac{10}{\mathrm{R}}=\frac{20}{40} \\ & \mathrm{R}=20 \Omega \\ & \mathrm{I}=\frac{40}{20}=2 \mathrm{~A}\end{aligned}$
Asked in: JEE Main 2025 (28 Jan Shift 2)