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Path to 300

Physics / Topic coverage

Magnetism/EMI/AC

EMI/AC circuits + magnetic force/torque — rising importance in recent papers.

Weight lowIntensity Rotate · fortnightlyTrend Rising300-target 9.7 /100low
Path to 300

Mark budget for this portion

Full 300 plan →
At ~9.8% of physics weight, this portion should reliably deliver ~10 of your 100 physics marks — treat misses here as rank-droppers.
7.3Floor marks
9.7Target marks
11.1Stretch marks
9.8%Of subject weight
100Subject target
At a glance

Coverage metrics

23Tagged questions
9.8%Of Physics
3.29Average / year
2024Peak year (5 Q)
7/7Years present
Official · 2026

Syllabus map for this portion

Full Physics syllabus →
Magnetism + EMI + AC circuits + EM waves.

Must cover from syllabus

  • Biot–Savart / Ampere field formulae
  • Faraday + Lenz
  • Series LCR with AC
  • EM spectrum elementary uses

Gaps / exclusions to watch

  • Instrument conversions (G→V/A)
Unit 01

Magnetism, EMI, AC and EM Waves

high

Exam focusBiot–Savart/Ampere fields; Faraday/Lenz; RC/LR/LC/LCR; spectrum basics.

Syllabus points

  • Biot–Savart and Ampere; field of straight wire, circular coil axis, long solenoid
  • Force on moving charge and current wire; magnetic moment of loop; galvanometer/voltmeter/ammeter conversions
  • Faraday, Lenz; self and mutual inductance; RC, LR, LC, series LCR with DC and AC
  • EM waves characteristics; spectrum (radio → γ) and elementary uses

Do / check

  • Write Lenz direction before computing induced emf
  • For LCR, reduce to Leff/Ceff when mutual inductance present
2020–2026

Year-wise appearance

Counts of tagged questions for this topic each year.

203
213
223
231
245
253
265

Reading the pattern

  • Magnetism/EMI/AC accounts for ~9.8% of tagged physics questions (2020–2026).
  • Trend signal: rising (early-window avg 3.0/yr vs recent avg 4.3/yr).
  • Appears in 7/7 tagged years; peak 2024 (5 Q), low 2023 (1 Q).
  • Dominant subtopics: EMI/AC (12), Magnetism (11).
  • Question-type mix: Multi correct 30.4%, Numerical 30.4%, Single correct 26.1%, Matching 13.0%.
Internal breakdown

Subtopic coverage

Start with the top subtopics — they usually carry most of this portion’s weight.

  • EMI/AC12 · 52.2%
  • Magnetism11 · 47.8%
SubtopicCountShareYears (count)
EMI/AC1252.2%2020·2 2022·2 2024·2 2025·3 2026·3
Magnetism1147.8%2020·1 2021·3 2022·1 2023·1 2024·3 2026·2
Exam form

Type & difficulty mix

Question types

  • Multi correct — 7 questions (30.4%)
  • Numerical — 7 questions (30.4%)
  • Single correct — 6 questions (26.1%)
  • Matching — 3 questions (13%)

Difficulty (heuristic)

  • H — 13 questions
  • M — 10 questions

Use for planning load only — not an official difficulty label.

Focused study

Plan for this portion

Must know

  • Faraday/Lenz quick checks
  • Mutual inductance LC resonance
  • AC phasors LCR
  • Force on current / charged particle in B

Common traps

  • Flux sign / Lenz direction
  • Wrong L_eff with mutual M

Weekly drill checklist

  • 2 EMI
  • 2 AC/LCR
  • 1 magnetism force

Prerequisite chain

Magnetostatics→EMI→AC→EM waves edge

Often joins with

ElectrostaticsCurrent ElectricityModern / EM waves
Paper pointers

Sample tagged questions

Use these as deliberate practice targets from past papers.

YearPaperQSubtopicTypeDiff
2020P1Q11MagnetismMCH
2020P1Q18EMI/ACNUMH
2020P2Q17EMI/ACNUMM
2021P2Q4MagnetismMCH
2021P2Q6MagnetismMCH
2021P2Q7MagnetismNUMM
Physics

Other portions

MechanicsOpticsThermodynamics/Kinetic TheoryElectrostaticsWaves/SHM/SoundModern PhysicsCurrent ElectricityFluid/Properties of Matter
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