The work done in moving a unit positive charge from one point to another against the electric field is a measure of:
Correct answer: B. Potential difference between two points
- A. Capacitance
- B. Potential difference between two points
- C. Intensity of electric field
- D. Resistance between two points
Explanation
Explanation:The workdone in moving a unit positive charge from one point to another against the electric field is equal to the potential difference between the two points. This is known as the voltage or electric potential difference, and is measured in volts (V). This option is not correct because capacitance is a measure of the ability of a system to store electrical charge. This option is also incorrect because intensity of electric field is a measure of the force per unit charge at a point in the electric field.This option is also incorrect because resistance is a measure of how much an object or material resists the flow of electric current.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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