1
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A toroid has a core (non-ferro magnetic) of inner radius 24 cm and outer radius 26 cm around which 2000 turns of a wire is wound. If the current in the wire is 12 A , the magnetic field inside the core of the toroid is

A

$1.92 \times 10^{-2} \mathrm{~T}$

B

$1.88 \times 10^{-2} \mathrm{~T}$

C

$2.12 \times 10^{-2} \mathrm{~T}$

D

$1.98 \times 10^{-2} \mathrm{~T}$

2
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A planet has magnetic dipole moment of $27 \times 10^{22} \mathrm{~A}-\mathrm{m}^2$. If the radius of the planet is 300 km , what would be the magnetic field at its equator? $\left(\right.$ use,$\left.\frac{\mu}{4 \pi}=10^{-7}\right)$

A

1 T

B

27 T

C

11 T

D

30 T

3
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A long solenoid has 20 turns per cm. A small loop of area $4 / \pi \mathrm{cm}^2$ is placed inside the solenoid normal to its axis. If the current carried by the solenoid changed steadily from 1.0 A to 3.0 A in 0.2 s , what is the magnitude of the induced emf in the loop while the current is changing?

A

$2.4 \mu \mathrm{~V}$

B

$32 \mu \mathrm{~V}$

C

$72 \mu \mathrm{~V}$

D

$4.8 \mu \mathrm{~V}$

4
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

An AC current is given by the expression, $I(t)=50 \sin (200 \pi t)$ in amperes. The frequency and rms value of the current, respectively are

A

$100 \mathrm{~Hz}, 50 \sqrt{2} \mathrm{~A}$

B

$100 \mathrm{~Hz}, 25 \sqrt{2} \mathrm{~A}$

C

$200 \mathrm{~Hz}, 50 \sqrt{2} \mathrm{~A}$

D

$200 \mathrm{~Hz}, 25 \sqrt{2} \mathrm{~A}$

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