1
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

The magnetic potential energy, when a magnetic bar of magnetic moment $$\vec{m}$$ is placed perpendicular to the magnetic field $$\vec{B}$$ is

A
$$-\frac{m B}{2}$$
B
Zero
C
$$-m B$$
D
$$m B$$
2
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

A bob is whirled in a horizontal circle by means of a string at an initial speed of $$10 \mathrm{~rpm}$$. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:

A
20 rpm
B
40 rpm
C
5 rpm
D
10 rpm
3
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

A metal cube of side $$5 \mathrm{~cm}$$ is charged with $$6 \mu \mathrm{C}$$. The surface charge density on the cube is

A
$$0.125 \times 10^{-3} \mathrm{C} \mathrm{m}^{-2}$$
B
$$0.25 \times 10^{-3} \mathrm{C} \mathrm{m}^{-2}$$
C
$$4 \times 10^{-3} \mathrm{C} \mathrm{m}^{-2}$$
D
$$0.4 \times 10^{-3} \mathrm{C} \mathrm{m}^{-2}$$
4
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

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
$$1<\mu_r<1+\varepsilon$$
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