GATE EE 2021 Set 1 — Question 52
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Electromagnetic Fields → Electrostatics → Capacitance
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Question
Consider a large parallel plate capacitor. The gap between the two plates is filled entirely with a dielectric slab of relative permittivity 5. The plates are initially charged to a potential difference of volts and then disconnected from the source. If the dielectric slab is pulled out completely, then the ratio of the new electric field in the gap to the original electric field is ______.
Correct answer
5 to 5
Solution
1.Initial State (with dielectric):
- Capacitance
- Potential
- Electric field
- Charge
- The source is disconnected, so the charge remains constant.
- New capacitance
- New potential
- New electric field
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