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College Physics (Urone)
Found in: Page 777

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Short Answer

Calculate the emfxof a dry cell for which a potentiometer is balanced when Rx=1.200Ω, while an alkaline standard cell with an emf 1.600Vof requires to Rs=1.247Ωbalance the potentiometer.

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

See the step by step solution

Step by Step Solution

Step 1: 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.

Step 2: Information Provided

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

Step 3: Calculation for EMF of the cell

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

Ex=EsRxRs =(1.600 V)1.200Ω1.247Ω =1.600 V×0.96 =1.540 V

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

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