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Formula Sheet

Magnetic Field and Earth's Magnetism — Formula Sheet

ICSE · Class 12 · Physics

18 formulas from Magnetic Field and Earth's Magnetism (ICSE Class 12 Physics) on one page, grouped by topic. Part of the ICSE Class 12 Physics syllabus.

43 questions32 flashcards18 formulas & key relations5 concepts

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18 Entries · 6 Sections

Formulas and Key Relations

1. Current Loop as a Magnetic Dipole

τ = IAB sinθ

m = IA

m→ = I A→

m→ = NIA→

τ→ = m→ × B→

2. Revolving Electron, Gyromagnetic Ratio, and Bohr Magneton

I = e/T = ev/(2πr)

A = πr²

J = mevr

m/J = e/(2me)

3. Magnetic Field of a Bar Magnet

B = (μ0/4π) × [2mr/(r² - l²)²]

4. Torque and Potential Energy of a Magnetic Dipole

τ = mB sinθ

τmax = mB

m = τmax/B

U = mB(cosθ1 - cosθ2)

Uθ = -mBcosθ

Current due to electron revolution is I = e/T.

Magnetic moment of revolving electron is m = evr/2.

Small-magnet approximation gives B ∝ 1/r^3.

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Frequently Asked Questions

What are the important topics in Magnetic Field and Earth's Magnetism for ICSE Class 12 Physics?
Key topics in Magnetic Field and Earth's Magnetism include Current Loop as a Magnetic Dipole, Magnetic Dipole Moment of a Revolving Electron, Magnetic Field of a Bar Magnet, Torque and Potential Energy of a Magnetic Dipole. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many formulas are in Magnetic Field and Earth's Magnetism?
This sheet lists 18 formulas from Magnetic Field and Earth's Magnetism, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Magnetic Field and Earth's Magnetism for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 43 practice questions on Magnetic Field and Earth's Magnetism. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 12 Physics Formula Sheet

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