1
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
2
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
$$\tan ^2 \theta=\tan ^2 \theta_1-\tan ^2 \theta_2$$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic permeability '$$\mu$$' a of a paramagnetic substance is :

A
$$\mu>1$$
B
$$\mu=1$$
C
$$\mu=0$$
D
$$\mu$$ is infinite
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Find the pole strength of a magnet of length $$2 \mathrm{~cm}$$, if the magnetic field strength $B$ at distance $$10 \mathrm{~cm}$$ from the centre of a magnet on the axial line of the magnet is $$10^{-4} \mathrm{~T}$$.

A
$$25 \mathrm{~Am}$$
B
$$100 \mathrm{~Am}$$
C
$$5 \times 10^{-2} \mathrm{~Am}$$
D
$$1 \times 10^{-4} \mathrm{~Am}$$
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