Mnemonics: Magnetism and Matter | Physics Class 12 - NEET PDF Download

1. Magnetic Properties of Materials

Types: Diamagnetic, Paramagnetic, Ferromagnetic, Antiferromagnetic, Ferrimagnetic

Mnemonic: "Don’t Play Football After Fights"

• Don’t – Diamagnetic

• Play – Paramagnetic

• Football – Ferromagnetic

• After – Antiferromagnetic

• Fights – Ferrimagnetic

This mnemonic makes it easier to remember the order of magnetic material types:

Diamagnetic – Weakly repelled by magnetic fields

Paramagnetic – Slightly attracted to magnetic fields

Ferromagnetic – Strongly attracted and retains magnetism

Antiferromagnetic – Opposing magnetic moments cancel out

Ferrimagnetic – Unequal opposing magnetic moments lead to net magnetism

2. Magnetic Elements of Earth

Mnemonic: "Dashing Indian Hero"

• Dashing – Declination

• Indian – Inclination

• Hero – Horizontal Component

This mnemonic helps you recall the three important magnetic elements of the Earth:

Declination – The angle between the magnetic north and true north (difference in direction).

Inclination – The angle between the magnetic field lines and the horizontal plane (also known as dip).

Horizontal Component – The component of the Earth's magnetic field that lies in the horizontal plane.

3. Order of Magnetic Susceptibility

Types: Diamagnetic < Paramagnetic < Ferromagnetic

Mnemonic: "Dull Plants Flourish"

• Dull – Diamagnetic (very low or negative susceptibility)

• Plants – Paramagnetic (positive but small susceptibility)

• Flourish – Ferromagnetic (large and positive susceptibility)

This mnemonic helps you remember the order of magnetic susceptibility for different materials:

Diamagnetic materials are weakly repelled by magnetic fields and have very low or negative susceptibility.

Paramagnetic materials are weakly attracted to magnetic fields with a small positive susceptibility.

Ferromagnetic materials have a large positive susceptibility, making them strongly attracted to magnetic fields and able to retain magnetism.

4. Magnetic Quantities and Their Meaning

Types: Magnetic Moment, Magnetisation, Magnetic Field Intensity, Magnetic Susceptibility, Relative Permeability

Mnemonic: "Mighty Monkeys Fight Strong Prides"

• Mighty – Magnetic Moment

• Monkeys – Magnetisation

• Fight – Field Intensity

• Strong – Susceptibility

• Prides – Permeability (Relative)

This mnemonic uses an image of "Mighty Monkeys Fighting Strong Prides" to help you recall the magnetic quantities:

Magnetic Moment – The strength and orientation of a magnet’s field.

Magnetisation – The degree of magnetization a material achieves in response to an external magnetic field.

Magnetic Field Intensity – The strength of the magnetic field produced by a current or magnet.

Magnetic Susceptibility – How easily a material becomes magnetized in the presence of a magnetic field.

Relative Permeability – The ratio of a material's permeability to that of free space.

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5. Magnetic Behaviour Based on Hysteresis

Types: Retentivity, Coercivity, Hysteresis Loss, Saturation

Mnemonic: "Rita Cooks Hot Soup"

• Rita – Retentivity
• Cooks – Coercivity
• Hot – Hysteresis Loss
• Soup – Saturation

This mnemonic helps you easily remember the key concepts related to hysteresis in magnetic materials:

Retentivity – The ability of a material to retain magnetization after the external magnetic field is removed.

Coercivity – The measure of the resistance of a material to becoming demagnetized.

Hysteresis Loss – Energy lost in the form of heat when a magnetic material is magnetized and demagnetized.

Saturation – The point at which an increase in the magnetic field does not result in any further increase in magnetization.

6. Magnetic Field Lines Characteristics

Types: Start from North, End at South, Never Cross, Form Closed Loops

Mnemonic: "Snakes Enter Narrow Caves"

• Snakes – Start at North
• Enter – End at South
• Narrow – Never Cross
• Caves – Closed Loops

This mnemonic helps you remember the important characteristics of magnetic field lines:

Start at North – Magnetic field lines begin at the north pole of a magnet.

End at South – Magnetic field lines end at the south pole of a magnet.

Never Cross – Magnetic field lines never intersect or cross each other.

Closed Loops – Magnetic field lines form closed loops, meaning they travel from the north pole to the south pole outside the magnet and loop back inside.

7. Units Related to Magnetism

Types: Ampere, Tesla, Weber, Henry

Mnemonic: "Ali Took Warm Hats"

• Ali – Ampere
• Took – Tesla
• Warm – Weber
• Hats – Henry

This mnemonic helps you remember the key units used in the study of magnetism:

Ampere – Unit of electric current.

Tesla – Unit of magnetic flux density (magnetic field strength).

Weber – Unit of magnetic flux.

Henry – Unit of inductance.

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