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1
AP EAPCET 2024 - 20th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
Any magnetic material loses its magnetic property when it is
A
dipped in water
B
dipped in sand
C
attached to an iron piece
D
heated to high temperature
2
AP EAPCET 2024 - 19th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The domain in ferromagnetic material is in the form of a cube of side $2 \mu \mathrm{~m}$. Number of atoms in that domain is $9 \times 10^{10}$ and each atom has a dipole movement of $9 \times 10^{-24} \mathrm{Am}^2$. The magnetisation of the domain is (approximately).
A
$10 \times 10^4 \mathrm{Am}^{-1}$
B
$8 \times 10^4 \mathrm{Am}^{-1}$
C
$12 \times 10^4 \mathrm{Am}^{-1}$
D
$9 \times 10^4 \mathrm{Am}^{-1}$
3
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A magnet suspended in a uniform magnetic field is heated, so as to reduce its magnetic moment by $19 \%$. By doing this, the time period of the magnet approximately
A
incresse by $11 \%$
B
decrease by $19 \%$
C
increases by $19 \%$
D
decreases by $4 \%$
4
AP EAPCET 2022 - 5th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two short magnets of equal dipole moments $$M$$ are fastened perpendicularly at their centres. The magnitude of the magnetic field at a distance $$d$$ from the centre on the bisector of the right angle is ($$\mu_0=$$ Permeability of free space)

A
$$\frac{\mu_0}{4 \pi} \frac{2 \sqrt{2} M}{d^3}$$
B
$$\frac{\mu_0}{4 \pi} \frac{5 M}{d^3}$$
C
$$\frac{\mu_0}{4 \pi} \frac{2 M}{d^3}$$
D
$$\frac{\mu_0}{4 \pi} \frac{10 M}{d^3}$$
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