# 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

Short Note

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.

Concept: Capacitance of a Parallel Plate Capacitor with and Without Dielectric Medium Between the Plates
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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 9 Capacitors
Short Answers | Q 7 | Page 163