AP EAMCET · PHYSICS · Current Electricity
A cell in secondary circuit gives null deflection for \(2.5 \mathrm{~m}\) length of potentiometer having \(10 \mathrm{~m}\) length of wire. If the length of the potentiometer wire is increased by \(1 \mathrm{~m}\) without changing the cell in the primary, the position of the null point now is
- A 3.5 m
- B 3 m
- C 2.75 m
- D 2.0 m
Answer & Solution
Correct Answer
(A) 3.5 m
Step-by-step Solution
Detailed explanation
Resistance of potentiometer wire \(R=\rho \times \frac{l}{A}\) or \(\quad R=\left(\rho \times \frac{10}{A}\right)\) The value of \(2.5 \mathrm{~m}\) length wire \(R^{\prime}=\frac{\rho \times 10}{A \times 10} \times 2.5\) or…
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