NEET 2023 Phase 1 · PhysicsPotentiometerPrevious Year Question
The emf of a cell (internal resistance 1 ) balances at 330 cm on a potentiometer. With a 2 external resistance across the cell, the balance length is:
Answer: (C) 220 cm. \textbf{Answer:} (3) 220 cm \textbf{Solution:} ℓ PD.
- A.115 cm
- B.332 cm
- C.220 cm✓
- D.330 cm
Correct Answer
(C) 220 cm
Solution & Explanation
\textbf{Answer:} (3) 220 cm \textbf{Solution:} ℓ PD. V = ER/(R+r) = (2/3)E ℓ = (2/3)330 = 220 cm.
🎯
43,000+ questions in हिंदी & English · one-tap toggle
Open →📚Practice all NEET Physics PYQs chapter-wise →💡Don't get it? Learn the Current Electricity concepts →Practice NEET 2023 Phase 1 Physics — free, with instant solutions
43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.
More NEET PYQ solutions
PhysIn a potentiometer, a cell of emf 1.5 V balances at 36 cm. If a 2.5 V cell replaces it, the balance length is:PhysA potentiometer is an accurate and versatile device to measure emf because the method involves:PhysA potentiometer wire is 100 cm long with a constant PD across it. Two cells in series give balance at 50 cm (aiding) and 10 cm (opposing). The ratio of emfs is:PhysAn electric dipole with dipole moment 5 × 10⁻⁶ C·m is aligned with the direction of a uniform electric field of magnitude 4 × 10⁵ N/C. The dipole is then rotated through an angle of 60° with respect to the electric field. The change in the potential energy of the dipole is:PhysTwo identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (radii negligible vs separation, treated as point charges) is best given as:PhysThe plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant K1 and K2 with thickness 3d/8 and d/2 respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If K1/K2 = 1.25, the value of K1 is:PhysA sphere of radius R is carved out of a uniform solid sphere of radius 2R (internally tangent, so its centre is at distance R from the big centre). The ratio of the moment of inertia of the small sphere to that of the remaining part, both about the Y-axis through the big sphere's centre, is:PhysThe Sun rotates once in 27 days. If it expanded to twice its present radius (uniform-density sphere, no external influence), its new period would be about: