1
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A sphere-1 with redius $R$ has charge $q$. Sphere-2 with radius $3 R$ is far from sphere-1 and is initially uncharged. If the two spheres are now connected with a thin conducting wire, then the ratio $\frac{\sigma_1}{\sigma_2}$ of the surface charge densities is

A

2.0

B

2.5

C

3.0

D

9.0

2
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Statement I Specific resistance depends on nature of material and independent of temperature of the material. Statement II A wire of resistance $6 \Omega$ is drawn out, so that its new length is four times its original length. The resistance of the new wire is $48 \Omega$.

Statement III Drift velocity is the average constant velocity acquired by free electrons inside a metal by the application of an electric field which results in current. Which of the following is correct?

A

Statements I, II and III are true.

B

Statement I is true but statements II, III is false.

C

Statement III is true but statements I, II are false.

D

Statements II, III are true but statement I is false.

3
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Find the mobility of electron in a wire, if its average collision time is $9.1 \times 10^{-15} \mathrm{~s}$. (Charge of electron $=1.6 \times 10^{-19} \mathrm{C}$ and mass of electron $=9.1 \times 10^{-31} \mathrm{~kg}$ )

A

$9.1 \times 10^{-3} \mathrm{~m}^2 / \mathrm{V}-\mathrm{s}$

B

$1.6 \times 10^{-3} \mathrm{~m}^2 / \mathrm{V}-\mathrm{s}$

C

$1.75 \times 10^{-3} \mathrm{~m}^2 / \mathrm{V}-\mathrm{s}$

D

$1 \times 10^{-3} \mathrm{~m}^2 / \mathrm{V}-\mathrm{s}$

4
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A current carrying loop $A B C D$ has two circular arcs $A D$ and $B C$ with radius 1 cm and 2 cm respectively, as shown in the figure. The two arcs $A D$ and $B C$ subtend a common angle $30^{\circ}$ at the centre $O$. If the current flowing in the loop is $\frac{12}{\pi} \mathrm{~A}$. Then, the magnitude of net magnetic field at $O$ is (given, $\mu_0=4 \pi \times 10^{-7}$ )

TS EAMCET 2022 (Online) 20th July Morning Shift Physics - Moving Charges and Magnetism Question 15 English
A

$0.5 \mu \mathrm{~T}$

B

$3 \mu \top$

C

$1 \mu \mathrm{~T}$

D

$1.5 \mu \mathrm{~T}$

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