Magnetic Properties of Materials
Physics ⇒ Electricity and Magnetism
Magnetic Properties of Materials starts at 10 and continues till grade 12.
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A bar of iron is placed in a uniform magnetic field. Describe what happens to the magnetic domains inside the iron bar.
A material has a relative permeability slightly greater than 1. What type of magnetic material is it?
A sample of bismuth is placed near a strong magnet and is observed to move away from the magnet. What does this indicate about the magnetic property of bismuth?
A sample of material is placed in a magnetic field and is found to be weakly repelled. What type of magnetic material is it most likely to be?
Define magnetic permeability.
Describe the main difference between paramagnetic and diamagnetic materials in terms of their response to an external magnetic field.
Explain the difference between hard and soft magnetic materials.
Explain the term 'hysteresis' in the context of magnetic materials.
Explain why diamagnetic materials are repelled by a magnetic field.
If the magnetic susceptibility (χ) of a material is -0.0001, what type of material is it?
Name one example each of diamagnetic, paramagnetic, and ferromagnetic materials.
State Curie's law for paramagnetic materials.
A long solenoid is filled with a material whose magnetic susceptibility is temperature-dependent and follows the relation χ = C/(T - θ), where C and θ are constants. Identify the type of magnetic material and explain the physical significance of θ in this context.
A paramagnetic material has a Curie constant C = 0.5 K. If its magnetic susceptibility at 300 K is 1.67 × 10-3, calculate the temperature at which its susceptibility will be 2.5 × 10-3.
A sample of a magnetic material is subjected to a cyclic magnetization process. The area enclosed by the B-H loop is measured. What does this area represent, and why is it important in practical applications?
A scientist discovers a new material that, when cooled below a certain temperature, exhibits zero electrical resistance and expels all magnetic fields from its interior. What is this phenomenon called, and what is the name of the temperature below which it occurs?
Consider two identical solenoids, one filled with a ferromagnetic material and the other with a paramagnetic material. If the same current is passed through both, which solenoid will produce a stronger magnetic field inside, and why?
