Magnetic Effect of Current & Electricity- NEET Previous Year Questions with Complete Solutions

Yes, it is one of the most important chapters in NEET Physics. The chapter appears consistently every year and the questions are relatively formula-based, making it a high-scoring chapter for well-prepared students. Cover all Tier 1 topics from the NCERT Class 12 Physics textbook and solve at least 10 years of PYQs for full preparation.

Biot-Savart law calculates the magnetic field produced by any current element of any shape — it is universally applicable. Ampere's circuital law is a simplified tool that works only when the current distribution has high geometric symmetry (infinite wire, solenoid, toroid). NEET questions specify the geometry, so identify symmetry first to choose the correct law.

The most frequently tested formulas are: B = μ₀I / 2πr (field due to a long straight wire), F = qvB sin θ (Lorentz force), and F = BIL sin θ (force on a conductor). These three alone cover roughly 60% of all PYQ numerical questions in this chapter from 2013 to 2024.

To convert a galvanometer to an ammeter, connect a low resistance (shunt) in parallel. To convert it to a voltmeter, connect a high resistance in series. The shunt value is S = IgG / (I − Ig) and the series resistance is R = (V/Ig) − G. NEET frequently tests these formulas with numerical substitution.

NCERT Class 12 Physics (Chapters 4 and 5) covers approximately 75–80% of what NEET asks from this chapter. The remaining 20–25% involves application-level questions that go slightly beyond NCERT examples. Solving 10+ years of PYQs alongside NCERT is the minimum preparation standard. NCERT examples and exercises should be solved completely before moving to PYQs.