Equipotential Surface Property
Electric field is ______ to equipotential surfaces.
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About This Question
- Subject
- physics
- Chapter
- electrostatics
- Topic
- equipotential surface property
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Perpendicular
- Definition: An equipotential surface is a surface where every point has the same electric potential (V).
- Energy Logic: To move a charge along such a surface, work done must be zero (W=qΔV=0).
- Work Formula: W=F⋅d=qE⋅d=0.
- Geometric Implication: Since q and d are non-zero, the dot product E⋅d must be zero (cosθ=0).
- Conclusion: θ=90∘. The electric field lines are always perpendicular (normal) to the equipotential surfaces at every point.
This easy difficulty physics question is from the chapter electrostatics, covering the topic of equipotential surface property. It appeared in the 2025 exam.
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