Exam-style question
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How does the introduction of a dielectric affect the energy stored in a capacitor?.
- A.It decreases the energy stored due to increased potential difference.
- B.It increases the energy stored by allowing more charge to be accumulated.
- C.It has no effect on the energy stored.
- D.It decreases the energy stored by reducing the capacitance.
Model answer
What a good answer should say
- It increases the energy stored by allowing more charge to be accumulated.
Explanation
Why this works
The introduction of a dielectric increases the energy stored in a capacitor because it allows more charge to be accumulated for the same potential difference. The mechanism involves the dielectric reducing the electric field strength, which enhances the capacitor's ability to store charge.
The consequence is that the overall energy storage capacity of the capacitor is improved, making it more effective in various applications.
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