Mnemonics: Electromagnetic Induction | Physics Class 12 - NEET PDF Download

1. Key Laws of Electromagnetic Induction

Types: Faraday’s First Law, Faraday’s Second Law, Lenz’s Law

Mnemonic: "Funny Friends Love-magnets"

• Funny – Faraday’s First Law

• Friends – Faraday’s Second Law

• Love-magnets – Lenz’s Law

This mnemonic helps you remember the three main laws in electromagnetic induction:

Faraday’s First Law: A changing magnetic field induces an EMF.

Faraday’s Second Law: The induced EMF is proportional to the rate of change of magnetic flux.

Lenz’s Law: The direction of the induced current opposes the change in magnetic flux, conserving energy.

2. Types of Induction

Types: Self Induction, Mutual Induction

Mnemonic: "Selfie Mode"

• Selfie – Self Induction

• Mode – Mutual Induction

This mnemonic helps you easily remember the two main types of electromagnetic induction:

• Self Induction: When a changing current in a coil induces EMF in the same coil.

• Mutual Induction: When a changing current in one coil induces EMF in a nearby coil.

“Selfie Mode” links the idea of “self” and “interaction with others,” just like self-induction affects itself, and mutual induction involves others.

3. Factors Affecting Induced EMF

Types: Number of Turns, Area of Coil, Magnetic Field Strength, Angle, Time

Mnemonic: "Nina Always Makes Amazing Tea"

• Nina – Number of Turns

• Always – Area of Coil

• Makes – Magnetic Field Strength

• Amazing – Angle (between field and area vector)

• Tea – Time (rate of change)

This mnemonic helps recall all key factors that influence the induced EMF in a coil:

Number of Turns: More turns → more EMF

Area of Coil: Larger area → greater flux

Magnetic Field Strength: Stronger field → higher EMF

Angle: EMF depends on the angle between magnetic field and area vector

Time: Faster change → greater EMF

4. Units in Electromagnetic Induction

Types: Volt, Weber, Henry, Ampere

Mnemonic: "Victor Was Hugging Alligators"

• Victor – Volt

• Was – Weber

• Hugging – Henry

• Alligators – Ampere

This mnemonic helps lock in the four essential SI units used in electromagnetism:

Volt (V) – for electric potential or EMF

Weber (Wb) – for magnetic flux

Henry (H) – for inductance

Ampere (A) – for electric current

5. Applications of Electromagnetic Induction

Types: AC Generator, Transformer, Induction Cooker, Eddy Currents

Mnemonic: "Aman Took Icecream Eagerly"

• Aman – AC Generator

• Took – Transformer

• Icecream – Induction Cooker

• Eagerly – Eddy Currents

This mnemonic helps you quickly recall devices and effects related to electromagnetic induction:

AC Generator – Produces alternating current using magnetic induction

Transformer – Steps voltage up or down in AC circuits

Induction Cooker – Uses changing magnetic fields to heat metal vessels

Eddy Currents – Circular currents induced in conductors, useful or wasteful based on application