Dielectric Effect
Mediumphysics
Fully inserting dielectric (constant K) between plates (battery disconnected) changes capacitance by factor?
Select the correct option:
Solution
Incorrect! Answer:
K
- Dielectric Mechanism: Dielectrics polarized in an external field create an internal opposing field, reducing the net electric field (E′=E/K).
- Voltage Change: Since V=Ed, the voltage also drops to V′=V/K (when the battery is disconnected so Q is constant).
- Capacitance Definition: C=Q/V.
- New Capacitance: C′=Q/V′=Q/(V/K)=K(Q/V)=KC.
- Conclusion: Inserting a dielectric always increases the capacitance by the factor K.
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About This Question
- Subject
- physics
- Chapter
- electrostatics
- Topic
- dielectric effect
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
K
- Dielectric Mechanism: Dielectrics polarized in an external field create an internal opposing field, reducing the net electric field (E′=E/K).
- Voltage Change: Since V=Ed, the voltage also drops to V′=V/K (when the battery is disconnected so Q is constant).
- Capacitance Definition: C=Q/V.
- New Capacitance: C′=Q/V′=Q/(V/K)=K(Q/V)=KC.
- Conclusion: Inserting a dielectric always increases the capacitance by the factor K.
This medium difficulty physics question is from the chapter electrostatics, covering the topic of dielectric effect. It appeared in the 2025 exam.
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