Magnetism and Matter is a critical subject matter in NEET Physics, covering standards like magnetic fields, magnetic houses of materials, Earth’s magnetism, and magnetic depth. Questions normally focus on expertise magnetic dipoles, the behavior of materials in magnetic fields, and calculations regarding magnetic pressure and ability electricity. Mastery of this subject matter aids in fixing questions about magnetic residences in count, that’s essential for NEET aspirants to strengthen their physics foundation and rating nicely inside the examination.
Magnetism and Matter is an essential a part of NEET physics, overlaying essential concepts and concepts associated with magnets, magnetic fields, and substances’ magnetic homes. This segment delves into the beginning of magnetism, exploring how magnetic fields have interaction with various substances, along with diamagnetic, paramagnetic, and ferromagnetic substances. Key principles include magnetic field strains, Earth’s magnetism, magnetic dipole moments, and houses like magnetic susceptibility and permeability. NEET questions about this topic often test understanding of applications in physics, conceptual readability, and trouble-fixing talents. By getting to know “Magnetism and Matter,” students enhance their hold close of electromagnetism, which is important now not handiest for NEET but additionally for a robust basis in bodily sciences and engineering concepts.
Magnetism and Matter is an essential subject matter in NEET Physics, and a strong understanding of the concepts is important for success. Here’s why:
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Magnetism and Matter NEET Questions with Answer | Click |
Concept | Description | Key Points |
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Magnetic Dipole Moment | A measure of the electricity of a magnetic supply, like a bar magnet. |
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Magnetic Field because of a Dipole | The magnetic field produced by means of a magnetic dipole at a factor in space. |
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Magnetic Field Lines and Their Properties | Imaginary traces that represent the path of the magnetic field. |
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Key NEET Questions on Magnetic Dipoles |
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Earth’s magnetic field, additionally called the geomagnetic area, is a magnetic field that extends from Earth’s interior out into space, where it interacts with the solar wind, a movement of charged particles emanating from the Sun. The magnetic area is generated by electric currents due to the movement of convection currents of a mixture of molten iron and nickel in Earth’s outer core.
There are three primary components of Earth’s magnetic field:
Earth’s magnetic field plays a crucial role in protecting life on Earth:
Type | Properties | Examples | NEET-Relevant Points |
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Diamagnetic |
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Bismuth, Copper, Water, Gold, Diamond, Lead |
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Paramagnetic |
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Aluminum, Platinum, Oxygen, Magnesium, Molybdenum |
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Ferromagnetic |
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Iron, Nickel, Cobalt, Gadolinium |
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In the world of electromagnetism, magnetization and magnetic depth are two crucial ideas that describe the magnetic properties of materials and the magnetic fields they generate or experience.
Definition: Magnetization is a vector quantity that represents the density of magnetic dipole moments within a material. It measures the degree to which a material is magnetized.
Origin: Magnetization arises from the alignment of atomic magnetic dipoles, which are created through the motion of electrons within atoms.
Unit: The SI unit of magnetization is Ampere per meter (A/m).
Definition: Magnetic intensity, also known as magnetic field strength, is a vector quantity that represents the external magnetic field applied to a material.
Source: It originates from external current sources or magnets.
Unit: The SI unit of magnetic intensity is also Ampere per meter (A/m).
The relationship between magnetic field (B), magnetic intensity (H), and magnetization (M) is defined by the following equation:
B = μ₀(H + M)
Where:
This equation reveals that the total magnetic field within a material is the sum of the magnetic field due to external sources (H) and the magnetic field induced by the material itself (M). The permeability of free space, μ₀, is a constant that characterizes the magnetic properties of a vacuum.
Concept | Definition | Significance |
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Magnetic Susceptibility (χ) | Dimensionless quantity that measures a material’s ability to magnetize in response to an applied magnetic field. | Determines the degree to which a material is attracted or repelled by a magnetic field. |
Relative Permeability (μr) | Ratio of the permeability of a material to the permeability of free space (μ₀). | Indicates how easily a material can be magnetized compared to a vacuum. |
Magnetic Hysteresis | Phenomenon where the magnetization of a material lags behind the applied magnetic field, resulting in a hysteresis loop. | Affects the behavior of ferromagnetic materials in applications like transformers and magnetic storage devices. |
Type of Material | Magnetic Susceptibility (χ) | Relative Permeability (μr) |
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Diamagnetic | Negative (χ < 0) | Less than 1 (μr < 1) |
Paramagnetic | Positive and small (0 < χ << 1) | Slightly greater than 1 (1 < μr < 1.01) |
Ferromagnetic | Positive and large (χ >> 1) | Much greater than 1 (μr >> 1) |
Definition: A material that retains its magnetic properties for a long period of time.
Source of Magnetism: Intrinsic magnetic properties of the material.
Magnetic Field: Constant and cannot be easily controlled.
Applications:
Definition: A magnet produced by using electric current.
Source of Magnetism: Electric current flowing through a coil of wire.
Magnetic Field: Can be controlled by adjusting the current flow.
Applications:
Feature | Permanent Magnet | Electromagnet |
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Source of Magnetism | Intrinsic material properties | Electric current |
Magnetic Field | Constant | Can be controlled |
Power Source | None | Requires electric current |
Strength | Limited by material properties | Can be varied by adjusting current |
Application | Technology/Medicine | How Magnetism Works |
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Data Storage | Hard drives, floppy disks, credit cards | Magnetic fields are used to align tiny magnetic particles on a surface, representing data. |
Electric Motors | Fans, blenders, vacuum cleaners | An electric current passing through a coil of wire interacts with a magnetic field, causing the coil to rotate. |
Generators | Power plants | Mechanical energy is converted into electrical energy by rotating a coil of wire within a magnetic field. |
Magnetic Resonance Imaging (MRI) | Medical diagnosis | Strong magnetic fields align the protons in the body’s water molecules. Radio waves are used to disturb these alignments, and the signals emitted as they return to their original state are used to create detailed images. |
Speakers and Headphones | Audio devices | An electric current passing through a coil of wire interacts with a magnetic field, causing the coil to vibrate and produce sound waves. |
Compasses | Navigation | The Earth’s magnetic field aligns the needle of a compass, pointing towards the Earth’s magnetic north pole. |
Ans: Magnetic moment is a vector quantity that represents the electricity and course of a magnet’s capability to align with an external magnetic subject.
Ans: Diamagnetic materials have paired electrons, weakly repel magnetic fields, and showcase a bad magnetic susceptibility.
Ans: A solenoid produces a magnetic field whilst electric powered contemporary flows thru it, growing a field inside that resembles a bar magnet.
Ans: Earth’s magnetic field, additionally referred to as the geomagnetic field, is the field generated through Earth’s center, performing like a massive magnet with poles near the geographic poles.
Ans: Magnetic susceptibility measures how much a material turns into magnetized in an applied magnetic field, indicating its magnetic properties.
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