AP EAMCET · PHYSICS · Current Electricity
The length of a potentiometer wires is l. A cell of emf \(E\) is balanced at a length \(\left(\frac{l}{3}\right)\) from positive end of the wire. If the length of the wire is increased by \(\left(\frac{l}{2}\right)\), the distance at which the same cell gives the balancing point is
(Cell in the primary is ideal and no series resistance is present in the primary circuit.)
- A \(\frac{2 l}{3}\)
- B \(\frac{I}{2}\)
- C \(\frac{I}{6}\)
- D \(\frac{4 l}{3}\)
Answer & Solution
Correct Answer
(B) \(\frac{I}{2}\)
Step-by-step Solution
Detailed explanation
According to question, the figure is as If \(K\) be the potential gradient of the potentiometer wire, then emf of the cell which gives balancing length \(\frac{l}{3}\) is given by \(E=K \cdot \frac{l}{3}\)...(i) Where, \(\quad E=\frac{V}{l} \cdot \frac{l}{3}=\frac{V}{3} \ldots\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- If the displacement (s in metre) of a moving particle in terms of time (t in second) is \(s=t^3-6 t^2+18 t+9\), then the minimum velocity attained by the particle isAP EAMCET 2025 Medium
- A wire of length \(l\) is bent into a circular coil of one turn of radius \(R_1\). Another wire of the same material and same area of cross-section and same lengths is bent into a circular coil of two turns of radius \(R_2\). When the same current flows, through the two coils, the ratio of magnetic induction at the centres of the two coils isAP EAMCET 2004 Hard
- A message signal of frequency \(8 \mathrm{kHz}\) and peak voltage \(12 \mathrm{~V}\) is used to modulate a carrier of frequency 1.2 MHz and peak voltage \(20 \mathrm{~V}\). The modulation index isAP EAMCET 2022 Medium
- A particle starts from rest and moves in a straight line. It travels a distance 2 L with uniform acceleration and then moves with a constant velocity a further distance of L. Finally, it comes to rest after moving a distance of 3L under uniform retardation. Then the ratio of average speed to the maximum speed \(\left(\frac{\bar{V}}{V_m}\right)\) of the particle isAP EAMCET 2024 Medium
- The efficiency of a heat engine that works between the temperatures where Celsius-Fahrenheit scales coincides and Kelvin-Fahrenheit scales coincides is (approximately)AP EAMCET 2024 Hard
- If a wheel starting from rest is rotating with an angular acceleration of \(\pi \mathrm{rad} \mathrm{s}^{-2}\), then the number of rotations made by the wheel in the first 6 seconds time isAP EAMCET 2025 Medium
More PYQs from AP EAMCET
- Time period of a simple pendulum in Air is T. If the pendulum is in water and executes SHM, its time period is \(t\). The value of \(\frac{\mathrm{T}}{t}\) is [density of bob is \(\frac{5000}{3} \mathrm{~kg} \mathrm{~m}^{-3}\) ]AP EAMCET 2024 Medium
- For any integer \(n \geq 1\), the sum \(\sum_{k=1}^n k(k+2)\) is equal toAP EAMCET 2008 Medium
- Which of the following options is correct for the object having a straight-line motion represented by the following graph?
AP EAMCET 2020 Medium - Boxes \(B_1, B_2\), and \(B_3\), contain balls as given below:
\(\begin{array}{ccc}
\text { Box } & \text { White } & \text { Black } \\
B_1 & 1 & 2 \\
B_2 & 3 & 1 \\
B_3 & 2 & 3
\end{array}\)
One ball is drawn at random from each box. Then, among the balls drawn, the probability that two are black and one is white, isAP EAMCET 2017 Medium - A solid sphere of radius carries a positive charge distributed uniformly throughout its volume. A very thin hole is drilled through it's center. A particle of mass and charge performs simple harmonic motion about the center of the sphere in this hole. The frequency of oscillation isAP EAMCET 2022 Medium
- If \(f(0)=0, f^{\prime}(0)=3\), then the derivative of \(y=f(f(f(f(f(x)))))\) at \(x=0\) isAP EAMCET 2024 Easy