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

There are two thin wire rings, each of radius $R$, whose axes coincide. The charges of the rings are $q$ and $-q$. The magnitude of potential difference between the centres of the rings separated by a distance $\sqrt{3} R$ is

A

0

B

$\frac{q}{4 \pi \varepsilon_0 R}$

C

$\frac{q}{4 \pi \varepsilon_0 R} \frac{1}{\sqrt{3} R}$

D

$\frac{q}{2 \pi \varepsilon_0 R}$

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

Statement I The temperature coefficient of resistance for most of metals in pure form is positive.

Statement II A metal wire 2 mm in diameter carries a charge of $360 \pi \mathrm{C}$ in two hours. If the metal contains $5 \times 10^{22}$ free electrons $/ \mathrm{cm}^3$, then drift velocity of the electrons in the wire is $6.25 \times 10^{10} \mathrm{~m} / \mathrm{s}$.

Statement III Semiconductors like pure germanium does not obey Ohm's law for all range of electric field values.

Which of the following is correct?

A

Statements I, II, III are true

B

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

C

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

D

Statements I, II, III are false

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

A cylindrical resistor of radius 7.0 mm and length 4.0 cm is made of material that has a resistivity of $10^{-6} \Omega-\mathrm{m}$. If the energy is dissipated at rate 1.54 W in the resistor, then the current density is

A

$\frac{10^6}{\sqrt{\pi}} \mathrm{~A} / \mathrm{m}^2$

B

$5 \times 10^5 \mathrm{~A} / \mathrm{m}^2$

C

$\sqrt{\pi} \times 10^5 \mathrm{~A} / \mathrm{m}^2$

D

$8.5 \times 10^4 \mathrm{~A} / \mathrm{m}^2$

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

Statement I A uniform electric field and a uniform magnetic field are pointed in the same direction. If an electron is projected in the same direction, the electron velocity will decrease in magnitude.

Statement II Two infinite long parallel wires are carrying current in the same direction. The magnetic field at a point mid-way between the wires is zero.

Statement III No net force acts on a rectangular coil carrying a steady current, when suspended in a uniform magnetic field.

Which of the following is correct?

A

Statements I, II and III are true

B

Statements I and II are true, but statement II is false

C

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

D

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

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