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A potentiometer is an ideal device of measuring potential difference because

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Important Questions on Electrical Measuring Instruments

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 7

A cell of internal resistance

1.5 Ω

and of emf

1.5 V

balances at

500 cm

on a potentiometer wire. If a wire of

15 Ω

is connected between the balance point and the cell, then the balance point will shift

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 8

For comparing the emf of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful?

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 9

The circuit shown here is used to compare the emf of two cells $E_{1}$ and $E_{2} (E_{1} > E_{2})$ . The null point is at $C$ , when the galvanometer is connected to $E_{1}$ . When the galvanometer is connected to $E_{2},$ the null point will be

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 10

A resistance of

4 Ω

, a wire of length

5

m

and a resistance

5 Ω

are joined in series and connected to a cell of emf

10 V

and internal resistance

1 Ω

. A parallel combination of two identical cells is balanced across

300 cm

of the wire. The emf

E

of each cell is

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 11

The length of a wire of a potentiometer is

100 cm

and the emf of its standard cell is

E

volt. It is employed to measure the emf of a battery whose internal resistance is

0.5 Ω

. If the balance point is obtained at

l = 30 cm

from the positive end, the emf of the battery is

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 12

Potentiometer wire of length

1 m

is connected in series with

490 Ω

resistance and

2 V

battery. If

0.2 mV {cm}^{- 1}

is the potential gradient, then the resistance of the potentiometer wire is

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 13

The figure shows a simple potentiometer circuit for measuring a small emf produced by a thermocouple. The meter wire $P Q$ has a resistance $5 Ω$ and the driver cell has an emf of $2 V$ . If a balanced point is obtained $0.600 m$ along $P Q$ when measuring an emf of $6.00 mV,$ what is the value of resistance $R$ ?

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 6 - Electrical Measuring Instruments>DPP>Q 14

Two cells of emfs approximately

5 V

and

10 V

are to be accurately compared using a potentiometer of length

400 cm

A potentiometer is an ideal device of measuring potential difference because

Important Questions on Electrical Measuring Instruments

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