1
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
$$45^{\circ}$$
2
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
$$ X \propto\frac{1}{T} $$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Steel is preferred to soft iron for making permanent magnets because,

A
Susceptibility of steel is less than one
B
Permeability of steel is slightly greater than soft iron
C
Steel has more coercivity than soft iron
D
Steel is more paramagnetic
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $$\theta_1$$ and $$\theta_2$$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of $$\operatorname{dip} \theta$$ is given by

A
$$\cot ^2 \theta=\cot ^2 \theta_1+\cot ^2 \theta_2$$
B
$$\tan ^2 \theta=\tan ^2 \theta_1+\tan ^2 \theta_2$$
C
$$\cot ^2 \theta=\cot ^2 \theta_1-\cot ^2 \theta_2$$
D
$$\tan ^2 \theta=\tan ^2 \theta_1-\tan ^2 \theta_2$$
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