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Q.

Which of the following devices would you use to maintain potential difference between two points of a conductor?


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a

A rheostat

b

A cell

c

An ammeter

d

A voltmeter 

answer is B.

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Detailed Solution

The cell is used to maintain the potential difference between two points of conductors.
A cell is an electrical equipment that converts chemical energy into electrical energy. The potential difference is the amount of work done by moving the unit charge from one place to another. And the notation for the potential difference is ‘V’. So the unit for the potential difference is volts.
 
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