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?
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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.
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