Current Electricity

JEE Main level, numerical answer, medium

208 of 380

Question 208 of 380

The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at B, will be ____ A.

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Answer: 2



VA=VB⇒ the bridge is balanced ⇒10R=2040R=20ΩI=4020=2 A\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}

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