Q146 / 160 · TS EAMCET 2023 (13 May Shift 1) · Physics
In a meter bridge experiment the ratio of the left gap resistance to the right gap resistance is $2: 3$. The balance length from left end is
- A$20 \mathrm{~cm}$
- B$60 \mathrm{~cm}$
- Correct answerC$50 \mathrm{~cm}$
- D$40 \mathrm{~cm}$
Solution
From meter bridge principle
$$
\begin{aligned}
& \frac{X}{R}=\frac{l_1}{100-l_1} \\
& \frac{3}{3}=\frac{l_1}{100-l_1} \Rightarrow 300-31_1=31_1 \\
& 30 \mathrm{i}=6 l_1 \Rightarrow 1_1=\frac{300}{6}=50 \mathrm{~cm}
\end{aligned}
$$
Hence, the correct answer is option: 'C'.