1
TS EAMCET 2022 (Online) 19th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A thin magnetic needle is placed in a magnetic field of 200 G with its axis at $30^{\circ}$ to the direction of the field. Find the magnetic moment of the needle, if it experiences a torque of 0.012 Nm in this field.

A

$1.2 \mathrm{~A}-\mathrm{m}^2$

B

$12.0 \mathrm{~A}-\mathrm{m}^2$

C

$0.6 \mathrm{~A}-\mathrm{m}^2$

D

$6.0 \mathrm{~A}-\mathrm{m}^2$

2
TS EAMCET 2022 (Online) 19th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A wire loop of area $0.2 \mathrm{~m}^2$ has a resistance of $20 \Omega$. A magnetic field pointing normal to the loop has a magnitude of 0.25 T and is reduced to zero at a uniform rate in $10^{-4} \mathrm{~s}$. What is induced emf and resulting current?

A

$50 \mathrm{~V}, 2.5 \mathrm{~A}$

B

$500 \mathrm{~V}, 25 \mathrm{~A}$

C

$250 \mathrm{~V}, 12.5 \mathrm{~A}$

D

$500 \mathrm{~V}, 2.5 \mathrm{~A}$

3
TS EAMCET 2022 (Online) 19th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A resistor of resistance of $100 \Omega$ is connected to an AC source $\varepsilon=10 \sin (250 \pi) t$. The energy dissipated as heat during $t=0$ to $t=1 \mathrm{~ms}$ is approximately.

A

$\frac{0.57}{\pi} \mathrm{~mJ}$

B

$\frac{1.141}{\pi} \mathrm{~mJ}$

C

1 mJ

D

0.5 mJ

4
TS EAMCET 2022 (Online) 19th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

About $20 \%$ of the power of a 100 W bulb is converted to visible radiation. Assuming that the radiation is emitted isotropically and neglecting reflection, the average intensity of visible radiation at a distance of 5 m is $\frac{\alpha}{25 \pi} \mathrm{~W} / \mathrm{m}^2$. The value of $\alpha$ is

A

15

B

5

C

37.5

D

30

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