NEET UG 2021 · Physics · Question 22
NEET 2021 Physics, question 22
Question 22 of the NEET 2021 paper (code O1) is a Physics question from Moving Charges and Magnetism. Its idea, Field of Thick Conductor, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q22 · Physics
A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the cable with the distance 'r' from the axis of the cable is represented by :
The figure, described in words
Four B vs r graphs: (1) linear rise to a peak then decaying curve; (2) rising curve that saturates; (3) curve rising ever more steeply (concave up); (4) straight line through origin rising throughout.
- 1[graph: B vs r, increases linearly to a peak (dotted line at peak) then decreases as a curve]Official answer
- 2[graph: B vs r, rises steeply from origin and saturates]
- 3[graph: B vs r, concave-up curve rising increasingly steeply]
- 4[graph: B vs r, straight line through origin rising throughout]
Official answer: option 1 · NTA final answer key
Same idea
The only question on Field of Thick Conductor
No other NEET paper from 2017–2026 tested this exact idea.
Field of Thick Conductor: 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. Ampere's Circuital Law alone had 8.