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Friday, 9 October

NEET UG 2020 · Physics · Question 172

NEET 2020 Physics, question 172

Question 172 of the NEET 2020 paper (code E1) is a Physics question from Moving Charges and Magnetism. Its idea, Magnetic Field of Solenoid, was asked twice, in 2020 and 2022, across NEET 2017–2026. The NTA final answer key gives option 1.

Updated 2026-10-08

Q172 · Physics

A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is :

(μ0=4π×10−7\mu_0 = 4\pi\times10^{-7} T m A−1^{-1})

  1. 16.28×10−46.28\times10^{-4} TOfficial answer
  2. 23.14×10−43.14\times10^{-4} T
  3. 36.28×10−56.28\times10^{-5} T
  4. 43.14×10−53.14\times10^{-5} T

Official answer: option 1 · NTA final answer key

Same idea

Magnetic Field of Solenoid, in other papers

NEET asked this idea twice, in 2020 and 2022. The other question below.

  • 2022 Q17A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of…Numerical · Medium

Magnetic Field of Solenoid: 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.

Chapter analysisStudy this chapterPractise this chapter

Moving Charges and Magnetism: questions per paper

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