JEE Mains · Physics · STD 12 - 3. current electricity
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.
- A 2
- B 10
- C 15
- D 4
Answer & Solution
Correct Answer
(A) 2
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \mathrm{V}_{\mathrm{A}}=\mathrm{V}_{\mathrm{B}} \Rightarrow \text { the bridge is balanced } \\ & \Rightarrow \frac{10}{\mathrm{R}}=\frac{20}{40} \\ & \mathrm{R}=20 \Omega \\ & \mathrm{I}=\frac{40}{20}=2 \mathrm{~A}\end{aligned}\)
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