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JEE Main

IMPORTANT

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If a copper wire is stretched to increase its length by $20 %$ . The percentage increase in resistance of the wire is _____%.

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Important Questions on Current Electricity

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 25 January 2023 Shift 1>Q 135

A uniform metallic wire carries a current

2 A

, when

3.4 V

battery is connected across it. The mass of uniform metallic wire is

8.92 \times 10^{- 3} kg

, density is

8.92 \times 10^{3} kg m^{- 3}

and resistivity is

1.7 \times 10^{- 8} Ω - m

The length of wire is :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 25 January 2023 Shift 1>Q 136

In the given circuit, the equivalent resistance between the terminal A and B is ____ $Ω$

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 25 January 2023 Shift 2>Q 137

The resistance of a wire is

5 Ω

. Its new resistance in ohm, if stretched to

5

times of its original length will be :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 25 January 2023 Shift 2>Q 138

Two cells are connected between points $A$ and $B$ as shown. Cell 1 has emf of $12 V$ and internal resistance of $3 Ω$ . Cell 2 has emf of $6 V$ and internal resistance of $6 Ω$ . An external resistor $R$ of $4 Ω$ is connected across $A$ and $B$ . The current flowing through $R$ will be ______ $A$ .

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 29 January 2023 Shift 1>Q 139

Ratio of thermal energy released in two resistor

R

and

3 R

connected in parallel in an electric circuit is :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 29 January 2023 Shift 1>Q 140

In a metre bridge experiment the balance point is obtained if the gaps are closed by

2 Ω

and

3 Ω

. A shunt of

X Ω

is added to

3 Ω

resistor to shift the balancing point by

22.5 cm

. The value of

X

is ______.

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 29 January 2023 Shift 2>Q 141

With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is

(A) directly proportional to the length of the potentiometer wire

(B) directly proportional to the potential gradient of the wire

(D) inversely proportional to the length of the potentiometer wire

Choose the correct option for the above statements:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 29 January 2023 Shift 2>Q 142

When two resistance

R_{1}

and

R_{2}

connected in series and introduced into the left gap of a meter bridge and a resistance of

10 Ω

is introduced into the right gap, a null point is found at

60 cm

from left side. When

R_{1}

and

R_{2}

are connected in parallel and introduced into the left gap, a resistance of

3 Ω

is introduced into the right-gap to get null point at

40 cm

from left end. The product of

R_{1} R_{2}

is ______

Ω^{2}

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is _____%.

Important Questions on Current Electricity

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If a copper wire is stretched to increase its length by $20 %$ . The percentage increase in resistance of the wire is _____%.