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1
TS EAMCET 2023 (Online) 13th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

materials suitable for permanent magnets, must have which of the following properties?

A

High retentivity, low coercivity and high permeability.

B

Low retentivity, low coercivity and low permeability.

C

Low retentivity, high coercivity and low permeability.

D

High retentivity, high coercivity and high permeability.

2
TS EAMCET 2023 (Online) 13th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The expression for the magnetic energy stored in a solenoid of length $L$, in terms of magnetic field $B$ and area $A$ is

A

$\frac{1}{2 \mu_0} B^2 A L$

B

$\frac{1}{2 \varepsilon_0} B^2 A L$

C

$\frac{1}{2 \mu_0} B A^2 L$

D

$\frac{1}{2 \varepsilon_0} B A^2 L$

3
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic susceptibility of ferromagnetic materials is

A
$<0$
B
$>1$
C
1
D
0
4
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A bar magnet has coercivity $4 \times 10^3 \mathrm{Am}^{-1}$. It is placed inside a solenoid of 12 cm length and 60 turns. The current that should be passed through the solenoid to demagnetise, the bar magnet is
A
2 A
B
4 A
C
6 A
D
8 A
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