Chapter 21: Q57PE (page 777)

What is the ${emf}_{x}$ of a cell being measured in a potentiometer, if the standard cell’s emf is 12.0 Vand the potentiometer balances for $R_{x} = 5.000 Ω$ and $R_{s} = 2.500 Ω$ ?

Short Answer

Expert verified

The of a cell being measured in a potentiometer is $E_{x} = 24.0 V$ .

Step by step solution

Concept Introduction

The electric potential generated by an electrochemical cell or a changing magnetic field is known as electromotive force. Electromotive force (EMF) is a well-known abbreviation.

Information Provided

Emf of a standard cell: $E_{s} = 12 V$
Resistance of the potentiometer: $R_{x} = 5 Ω$
Standard resistance value: $R_{s} = 2.5 Ω$

Calculation for EMF of the cell

Calculate ${emf}_{x}$ , of a cell using a potentiometer. The formula is -

$E_{x} = E_{s} \frac{R_{x}}{R_{s}} = (12 V) \frac{5 Ω}{2.5 Ω} = 12 V \times 2.0 = 24.0 V$

Therefore, the value for emf is $E_{x} = 24.0 V$ .

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What is the ${emf}_{x}$ of a cell being measured in a potentiometer, if the standard cell’s emf is 12.0 Vand the potentiometer balances for $R_{x} = 5.000 Ω$ and $R_{s} = 2.500 Ω$ ?

Short Answer

Step by step solution

Concept Introduction

Information Provided

Calculation for EMF of the cell

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What is the emfxof a cell being measured in a potentiometer, if the standard cell’s emf is 12.0 Vand the potentiometer balances forRx=5.000Ωand Rs=2.500Ω?

Short Answer

Step by step solution

Concept Introduction

Information Provided

Calculation for EMF of the cell

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Scientific Method Physics

Nuclear Physics

Fluids

Electrostatics

Fundamentals of Physics

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Study anywhere. Anytime. Across all devices.

What is the ${emf}_{x}$ of a cell being measured in a potentiometer, if the standard cell’s emf is 12.0 Vand the potentiometer balances for $R_{x} = 5.000 Ω$ and $R_{s} = 2.500 Ω$ ?