Electric Potential
A charge of +5 nC is moved from infinity to a point where the potential is 100 V. How much work is done?
Select the correct option:
Solution
5 × 10⁻⁷ J
- Work-Potential Relation: The external work done (W) in moving a charge q is the product of charge and potential difference.
- W=q(Vfinal−Vinitial).
- Identify State:
- At infinity, potential is zero (Vinitial=0).
- Final potential V=100 V.
- Charge q=5×10−9 C (5 nC).
- Calculation:
- W=5×10−9×(100−0)
- W=5×10−7 Joules.
- Note: This work is positive, meaning external energy was required to bring the positive charge towards another positive source.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More electric potential Practice Questions
Two protons are brought from very far apart to a separation of 1 femtometre inside a fusion reactor ...
Two protons are brought from very far apart to a separation of 1 femtometre inside a fusion reactor ...
Moving a charge of 3 microcoulomb between two points raises its potential energy by changing potenti...
Moving a charge of 3 microcoulomb between two points raises its potential energy by changing potenti...
At a radial distance of 0.5 m from an isolated point charge of 5 nanocoulomb the potential takes a d...
At a radial distance of 0.5 m from an isolated point charge of 5 nanocoulomb the potential takes a d...
What is the electric potential at a point 40 cm from a point charge of (+8) nC in vacuum?
What is the electric potential at a point 40 cm from a point charge of (+8) nC in vacuum?
A charge of (+3) μC is moved from a point where the electric potential is 200 V to a point where t...
A charge of (+3) μC is moved from a point where the electric potential is 200 V to a point where t...
Equipotential surfaces for a uniform electric field directed along the positive x-axis are best desc...
Equipotential surfaces for a uniform electric field directed along the positive x-axis are best desc...
About This Question
- Subject
- physics
- Chapter
- electrostatics
- Topic
- electric potential
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
5 × 10⁻⁷ J
- Work-Potential Relation: The external work done (W) in moving a charge q is the product of charge and potential difference.
- W=q(Vfinal−Vinitial).
- Identify State:
- At infinity, potential is zero (Vinitial=0).
- Final potential V=100 V.
- Charge q=5×10−9 C (5 nC).
- Calculation:
- W=5×10−9×(100−0)
- W=5×10−7 Joules.
- Note: This work is positive, meaning external energy was required to bring the positive charge towards another positive source.
This easy difficulty physics question is from the chapter electrostatics, covering the topic of electric potential. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse electrostatics questions on RankGuru.