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Question

Instrument which can measure terminal potential difference as well as electromotive force (e.m.f.) is :

A
Wheatstone's meter bridge
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B
Voltmeter
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C
Potentiometer
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D
Galvanometer
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Solution

The correct option is C Voltmeter
EMF of a cell or battery is the total voltage or potential difference developed between the two terminals of the cell/battery when the two terminals are in open circuit condition.
Terminal Voltage of a cell or battery is the potential difference build between the two terminals of the cell/battery or load when a load is connected to the cell or battery or when a current is being drawn from the cell or battery.
Voltmeter is used to measure both depending upon the state of connected batttery or cell.

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