BrainIt

Physics

Moving Charges and Magnetism

A Physics chapter of the NEET syllabus, and how to practise it for the computer-based exam.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Moving Charges and Magnetism carried 5 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Moving Charges and Magnetism, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

A 100-turn closely wound circular coil of radius 5 cm has a magnetic field of 3.14×10−33.14 \times 10^{-3} T at its centre. The current flowing through the coil, and the magnitude of the magnetic moment of this coil are, respectively: (Take μ0=4π×10−7\mu_0 = 4\pi \times 10^{-7} T m/A)
  1. A.2 A, 10 A m2^2
  2. B.2.5 A, 20 A m2^2
  3. C.2 A, 4 A m2^2
  4. D.2.5 A, 2 A m2^2
Answer and explanation

Answer: D

From B=μ0Ni2RB = \frac{\mu_0 N i}{2R}, the current is i=2RBμ0N=2×5×10−2×3.14×10−34π×10−7×100=2.5i = \frac{2RB}{\mu_0 N} = \frac{2\times5\times10^{-2}\times3.14\times10^{-3}}{4\pi\times10^{-7}\times100} = 2.5 A. The magnetic moment M=NiA=NiπR2=100×2.5×π×(0.05)2≈2M = NiA = Ni\pi R^2 = 100\times2.5\times\pi\times(0.05)^2 \approx 2 A m2^2. Only option D gives both correct values.

Question 2 · NEET 2026

Two infinitely long parallel conducting wires AA and BB carry currents II and 2I2I, respectively, in the same direction. The wire AA has uniform mass per unit length λ\lambda and lies on an insulated floor. The wire BB is kept fixed at a height hh above the floor. The minimum magnitude of hh so that the wire AA does not rise from the floor is: [gg is the acceleration due to gravity and μ0\mu_0 is the permeability of free space.]
  1. A.μ0I22πλg\frac{\mu_0 I^2}{2\pi\lambda g}
  2. B.μ0I2πλg\frac{\mu_0 I^2}{\pi\lambda g}
  3. C.2μ0I2πλg\frac{2\mu_0 I^2}{\pi\lambda g}
  4. D.4μ0I2πλg\frac{4\mu_0 I^2}{\pi\lambda g}
Answer and explanation

Answer: B

Parallel currents in the SAME direction attract, so wire BB pulls wire AA upwards with force per unit length μ0(I)(2I)2πh=μ0I2πh\frac{\mu_0 (I)(2I)}{2\pi h} = \frac{\mu_0 I^2}{\pi h}. Wire AA stays on the floor as long as this does not exceed its weight per unit length λg\lambda g, so μ0I2πh≤λg\frac{\mu_0 I^2}{\pi h} \le \lambda g and hmin=μ0I2πλgh_{min} = \frac{\mu_0 I^2}{\pi\lambda g}. NCERT Class 12, Moving Charges and Magnetism (force between two parallel currents).

How to practise Moving Charges and Magnetism

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free NEET mini mock with answers.

Nearby Physics chapters

Questions

How many questions did Moving Charges and Magnetism have in NEET 2026?

Moving Charges and Magnetism carried 5 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Moving Charges and Magnetism PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Moving Charges and Magnetism important for NEET 2027?

It is part of the Physics syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

Something here wrong or out of date? Email hello@brainit.pro and a person will read it.