MHT CET · Physics · Current Electricity
The resistances in the left and right gap of a metre bridge are \(40 \Omega\) and \(60 \Omega\) respectively. When the bridge is balanced, the distance of the null point from the centre of the wire towards left is
- A 5 cm
- B 10 cm
- C 15 cm
- D 20 cm
Answer & Solution
Correct Answer
(B) 10 cm
Step-by-step Solution
Detailed explanation
From the given data,
\(\begin{aligned}
& \frac{40}{60}=\frac{50-l}{50+l} \\
& 2000+40 l=3000-60 l \\
& 100 l=1000 \\
\therefore \quad & l=10 \mathrm{~cm}
\end{aligned}\)
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