EASY
12th Karnataka Board
IMPORTANT
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Why soft iron is used for electromagnet.

Important Questions on Magnetism and Matter

EASY
12th Karnataka Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 5 - Magnetism and Matter>Exercise>Q 15
How does the intensity of magnetisation of a paramagnetic material vary with increasing applied magnetic field? With increasing temperature?
MEDIUM
12th Karnataka Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 5 - Magnetism and Matter>Exercise>Q 16
Why is pure iron not used for making permanent magnets?
HARD
12th Karnataka Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 5 - Magnetism and Matter>Exercise>Q 17
Explain quantitatively the order of magnitude difference between the diamagnetic susceptibility of N2(~5×10-9)(at STP)and Cu(~10-5).
HARD
12th Karnataka Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 5 - Magnetism and Matter>Exercise>Q 18
What are the dimensions of χ, the magnetic susceptibility? Consider an H-atom. Guess an expression for χ, upto a constant by constructing a quantity of dimensions of χ, out of parameters of the atom: e, m, v, R and μ0. Here, m is the electronic mass, v is electronic velocity, R is Bohr radius. Estimate the number so obtained and compare with the value of |χ|~10-5 for many solid materials.
EASY
12th Karnataka Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 5 - Magnetism and Matter>Exercise>Q 19

An iron rod of cross section 1 cm2 is placed in magnetic field of 200 oersted. It produces in magnetic field of 3000 G. Find magnetic permeability and magnetic susceptibility of the material.

HARD
12th Karnataka Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 5 - Magnetism and Matter>Exercise>Q 20
Define intensity of magnetisation of a magnetic material.