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1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following is not a characteristic of diamagnetism?
A
The material moves from a region of strong magnetic field to weak magnetic field.
B
The origin of diamagnetism is the spin of electrons.
C
Their magnetic susceptibility is small and negative.
D
Diamagnetic materials are repelled by bar magnets.
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-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
A
$1: 2$
B
$4: 1$
C
$2: 1$
D
$1: 4$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved, by rotating it, the angle by which it is to be rotated is

A
$$90^{\circ}$$
B
$$30^{\circ}$$
C
$$60^{\circ}$$
D
$$45^{\circ}$$
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

For a paramagnetic material, the dependence of the magnetic susceptibility $$\chi$$ on the absolute temperature is given as

A
Independent of $$\mathrm{T}$$
B
$$ X \propto \frac{1}{T^2} $$
C
$$ X \propto T $$
D
$$ X \propto\frac{1}{T} $$
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