Internal resistance of a cell is independent of

the circuit elements connected to it

concentration of the electrolytes

temperature of the electrolytes

HARD

KEAM

IMPORTANT

Earn 100

A parallel plate capacitor (of capacitance $C)$ with circular plates of radius $r_{0}$ located at position $\pm α,$ is connected in series with a resistor $R$ and is charged by a battery of voltage $V .$ Consider a circular loop $L$ of radius $\underline{r_{0}}$ parallel to the capacitor plates is located at $\bar{2}$ the center. Which of the following statements is correct ?

50% studentsanswered this correctly

Important Questions on Current Electricity

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2020>Q 1

The contribution to the total current in a semiconductor, due to electrons and holes are

0.75

and

0.25

respectively. The drift velocity of electrons is

\frac{3}{2}

times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2018>Q 2

A wire made of aluminium having resistivity

ρ = 2.8 \times 10^{- 8} Ω - m

with a circular cross-section and has a radius of

2 \times 10^{- 3} m

. A current of

5 A

flows through the wire. If the voltage difference between the ends is

1 V

, the length of the wire in

m

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2018>Q 3

The electrical conductivity of a metal is

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2018>Q 4

Consider a cylindrical conductor of length

L

and area of cross-section

A

. The specific conductivity varies as

σ (x) = σ_{0} \frac{L}{\sqrt{x}}

where

x

is the distance along the axis of the cylinder from one of its ends. The resistance of the system along the cylindrical axis is

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2020>Q 5

A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities that remains/remain constant along the length of the conductor is/are

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2019>Q 6

Find the voltage and current passing through the resistor $R_{2}$ shown in the following circuit

Question Image

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2020>Q 7

In a platinum resistance thermometer, the resistances of the wire at ice point and steam point are of

4 Ω

and

4.25 Ω

respectively. When the thermometer is kept in a hot water bath, whose temperature is not known, the resistance of the wire is found to be

4.5 Ω .

The temperature of the hot water bath is

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 24 - Current Electricity>KEAM 2019>Q 8

The resistor

R_{1} = 3 Ω

and

R_{2} = 1 Ω

are connected in parallel to a

20 V

battery. Find the heat developed in the resistor

R_{1}

in one minute

Important Questions on Current Electricity

Learn and Prepare for any exam you want !