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Friday, 9 October

NEET UG 2021 · Physics · Question 38

NEET 2021 Physics, question 38

Question 38 of the NEET 2021 paper (code O1) is a Physics question from Moving Charges and Magnetism. Its idea, Magnetic Moment of a Current Loop, was asked twice, in 2021 and 2025, across NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q38 · Physics

A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of,

(i) an equilateral triangle of side 'a'.

(ii) a square of side 'a'.

The magnetic dipole moments of the coil in each case respectively are :

  1. 13 Ia2Ia^{2} and 4 Ia2Ia^{2}
  2. 24 Ia2Ia^{2} and 3 Ia2Ia^{2}
  3. 33\sqrt{3} Ia2Ia^{2} and 3 Ia2Ia^{2}Official answer
  4. 43 Ia2Ia^{2} and Ia2Ia^{2}

Official answer: option 3 · NTA final answer key

Same idea

Magnetic Moment of a Current Loop, in other papers

NEET asked this idea twice, in 2021 and 2025. The other question below.

  • 2025 Q12A 2 amp current is flowing through two different small circular copper coils having radii ratio 1:2. The ratio of their respective…Numerical · Easy

Magnetic Moment of a Current Loop: every question and how it was framed

The chapter

Moving Charges and Magnetism in ten years of NEET

22 questions from 2017–2026, asked in 10 of 10 papers, about 2.1 a paper. Magnetic Force on Charges and Currents alone had 10.

Chapter analysisStudy this chapterPractise this chapter

Moving Charges and Magnetism: questions per paper

0242’172’182’191’204’213’222’231’243’252’26