Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
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# So, as the Energy Decreases, the Force Due to the Electric Field of the Capacitor Increases When the Dielectric is Dragged into the Capacitor. - Physics

ConceptCapacitance of a Parallel Plate Capacitor with and Without Dielectric Medium Between the Plates

#### Question

When a dielectric slab is gradually inserted between the plates of an isolated parallel-plate capacitor, the energy of the system decreases. What can you conclude about the force on the slab exerted by the electric field?

#### Solution

As the energy of the system decreases, the change in the energy is negative. Force is defined as a negative rate of change of energy with respect to distance.

F = -(∂U)/(∂x)

So, as the energy decreases, the force due to the electric field of the capacitor increases when the dielectric is dragged into the capacitor.

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#### APPEARS IN

HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 9: Capacitors
Short Answers | Q: 7 | Page no. 163

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Solution So, as the Energy Decreases, the Force Due to the Electric Field of the Capacitor Increases When the Dielectric is Dragged into the Capacitor. Concept: Capacitance of a Parallel Plate Capacitor with and Without Dielectric Medium Between the Plates.
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