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Chapter 21: Q58PE (page 777)

Calculate theemfxof a dry cell for which a potentiometer is balanced whenRx=1.200惟, while an alkaline standard cell with an emf 1.600Vof requiresto Rs=1.247惟balance the potentiometer.

Short Answer

Expert verified

The of a dry cell being for which a potentiometer is balanced is Ex=1.540V.

Step by step solution

01

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.

02

Information Provided

  • Emf of a standard cell:Es=1.600V
  • Resistance of the potentiometer:Rx=1.200惟
  • Standard resistance value:Rs=1.247惟
03

Calculation for EMF of the cell

Calculate of a cell using a potentiometer. The formula is -

Ex=EsRxRs=(1.600V)1.200惟1.247惟=1.600V脳0.96=1.540V

Therefore, the value for emf is Ex=1.540V.

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