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Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectrostatic Potential and Capacitance1 Mark
MCQ
A parallel plate air capacitor has capacity $′C′$ farad, potential $′V′$ volt and energy $′E′$ joule. When the gap between the plates is completely filled with dielectric.
  • A
    Both $V$ and $E$ increase
  • ✓
    Both $V$ and $E$ decrease
  • C
    $V$ decreases, $E$ increases
  • D
    $V$ increases, $E$ decreases
✓

Answer

Correct option: B.
Both $V$ and $E$ decrease

A parallel $-$ plate capacitor with a dielectric. The electric field is reduced between the plates because the dielectric material is polarized, producing an opposing field. When there is a dielectric, the potential is also reduced because potential is inversely proportional to dielectric

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