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Question

 is a device that sets up a constant potential difference across a conductor in an electric circuit.
  1. resistor
  2. battery
  3. voltmeter
  4. generator


Solution

The correct option is B battery
A battery is a type of an emf device that is responsible for the potential difference across a component in an electric circuit. Because of this, the electric field will be able to persist in the circuit and the flow of electric current happens. 

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