COMEDK 2024 Evening Shift | Magnetism and Matter Question 1 | Physics

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

$$90^{\circ}$$

$$30^{\circ}$$

$$60^{\circ}$$

$$45^{\circ}$$

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

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

Independent of $$\mathrm{T}$$

$$ X \propto \frac{1}{T^2} $$

$$ X \propto T $$

$$ X \propto\frac{1}{T} $$

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

-0

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

Susceptibility of steel is less than one

Permeability of steel is slightly greater than soft iron

Steel has more coercivity than soft iron

Steel is more paramagnetic

COMEDK 2023 Morning Shift

MCQ (Single Correct Answer)

-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

$$\cot ^2 \theta=\cot ^2 \theta_1+\cot ^2 \theta_2$$

$$\tan ^2 \theta=\tan ^2 \theta_1+\tan ^2 \theta_2$$

$$\cot ^2 \theta=\cot ^2 \theta_1-\cot ^2 \theta_2$$

$$\tan ^2 \theta=\tan ^2 \theta_1-\tan ^2 \theta_2$$

COMEDK Subjects