1
NEET 2024 (Re-Examination)
+4
-1

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and $$\varepsilon$$ is a small positive number) is

A
$$\mu<\mu_0$$
B
$$0 \leq \mu_r<1$$
C
$$-1 \leq \chi<0$$
D
$$1<\mu_r<1+\varepsilon$$
2
NEET 2024 (Re-Examination)
+4
-1

The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, $$1.0 \times 10^{-2} \mathrm{~A} \mathrm{~m}^2$$ and $$\frac{10^{-6}}{\pi^2} \mathrm{~kg} \mathrm{~m}^2$$. If it completes 10 oscillations in $$10 \mathrm{~s}$$, the magnitude of the magnetic field is

A
0.4 T
B
4 T
C
0.4 mT
D
4 mT
3
NEET 2024 (Re-Examination)
+4
-1

The magnetic moment of an iron bar is $$M$$. It is now bent in such a way that it forms an arc section of a circle subtending an angle of $$60^{\circ}$$ at the centre. The magnetic moment of this arc section is

A
$$\frac{3 M}{\pi}$$
B
$$\frac{4 M}{\pi}$$
C
$$\frac{M}{\pi}$$
D
$$\frac{2 M}{\pi}$$
4
NEET 2024
+4
-1

In a uniform magnetic field of $$0.049 \mathrm{~T}$$, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $$9.8 \times 10^{-6} \mathrm{~kg} \mathrm{~m}^2$$. If the magnitude of magnetic moment of the needle is $$x \times 10^{-5} \mathrm{~Am}^2$$, then the value of '$$x$$' is :

A
5$$\pi^2$$
B
128$$\pi^2$$
C
50$$\pi^2$$
D
1280$$\pi^2$$
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