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Friday, 9 October

NEET UG 2021 · Physics · Question 16

NEET 2021 Physics, question 16

Question 16 of the NEET 2021 paper (code O1) is a Physics question from Electrostatic Potential and Capacitance. Its idea, Common Potential in Charge Sharing, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q16 · Physics

Two charged spherical conductors of radius R1R_1 and R2R_2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1/σ2\sigma_1/\sigma_2) is :

  1. 1(R1R2)\sqrt{\left(\frac{R_1}{R_2}\right)}
  2. 2R12R22\frac{R_1^{2}}{R_2^{2}}
  3. 3R1R2\frac{R_1}{R_2}
  4. 4R2R1\frac{R_2}{R_1}Official answer

Official answer: option 4 · NTA final answer key

Same idea

The only question on Common Potential in Charge Sharing

No other NEET paper from 2017–2026 tested this exact idea.

Common Potential in Charge Sharing: every question and how it was framed

The chapter

Electrostatic Potential and Capacitance in ten years of NEET

23 questions from 2017–2026, asked in 9 of 10 papers, about 2.2 a paper. Capacitance alone had 14.

Chapter analysisStudy this chapterPractise this chapter

Electrostatic Potential and Capacitance: questions per paper

0242’171’180’193’204’213’222’234’241’253’26