COMEDK 2025 Evening Shift | Magnetism and Matter Question 2 | Physics

A metal rod of susceptibility 799 is subjected to a magnetising field of $2000 \mathrm{Am}^{-1}$. The permeability of the material of the rod is: (Given $\mu_0=4 \pi \times 10^{-7} \mathrm{TmA}^{-1}$ )

$4.2 \pi \times 10^{-7} T m A^{-1}$

$3.2 \pi \times 10^{-4} \mathrm{TmA}^{-1}$

$2.4 \pi \times 10^{-5} \mathrm{TmA}^{-1}$

$80 \pi \times 10^{-7} T m A^{-1}$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

For a short magnet, the magnetic field on the axial line at a distance 10 cm from its centre is $1.6 \mathrm{~m} \times 10^{-7} \mathrm{~T}$. What is the magnetic field on its equatorial line at the same distance 10 cm from its centre?

$4.8 \times 10^{-7} T$

$3.2 \times 10^{-8} T$

$1.6 \times 10^{-7} T$

$0.8 \times 10^{-7} T$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

Which of the following is not a characteristic of diamagnetism?

The material moves from a region of strong magnetic field to weak magnetic field.

The origin of diamagnetism is the spin of electrons.

Their magnetic susceptibility is small and negative.

Diamagnetic materials are repelled by bar magnets.

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

A bar magnet is oscillating in the earth's magnetic field with a period $T$. When the length of the bar magnet is doubled and its mass is quadrupled, the time period is $T_1$. The ratio of $T_1$ to $T$ is

$1: 2$

$4: 1$

$2: 1$

$1: 4$

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