TS EAMCET 2022 (Online) 19th July Morning Shift | Current Electricity Question 45 | Physics

The resistivity of a metal is $1 \times 10^{-8} \Omega-\mathrm{m}$. If it contains $9 \times 10^{28}$ electrons per $\mathrm{m}^3$, then the relaxation time of electrons inside the metal is nearly

(electron mass $=9 \times 10^{-31} \mathrm{~kg}$ )

$4 \times 10^{-14} \mathrm{~s}$

$7 \times 10^{-14} \mathrm{~s}$

$1.0 \times 10^{-14} \mathrm{~s}$

$9 \times 10^{-14} \mathrm{~s}$

TS EAMCET 2022 (Online) 18th July Evening Shift

MCQ (Single Correct Answer)

-0

A cylindrical metallic wire is stretched to increase its length in such a way that the metallic wire changes its resistance by $6 \%$. The percentage increase in its length is

$2 \%$

$4 \%$

$3 \%$

$12 \%$

TS EAMCET 2022 (Online) 18th July Evening Shift

MCQ (Single Correct Answer)

-0

Find the current in the three resistors as shown in the following figure?

TS EAMCET 2022 (Online) 18th July Evening Shift Physics - Current Electricity Question 22 English

$i_1=0, i_2=\frac{4 V}{R}, i_3=\frac{2 V}{R}$

$i_1=0, i_2=0, i_3=0$

$i_1=0, i_2=\frac{2 V}{R}, i_3=\frac{4 V}{R}$

$i_1=0, i_2=\frac{2 V}{R}, i_3=\frac{2 V}{R}$

TS EAMCET 2022 (Online) 18th July Evening Shift

MCQ (Single Correct Answer)

-0

The resistivity of a material is found to be $10^8 \Omega-\mathrm{m}$, then the material would be

Only insulator

Only metal

Only semiconductor

Only Superconductor

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