Electrostatic Potential & Capacitance
Class 12 · Electrostatic Potential & Capacitance

Dielectric Slab Insertion

Slab gets pulled in by force F = ε₀bV²(κ−1)/(2d).

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Key Notes

01

When a dielectric slab is partially inserted, it gets pulled in (force F = ε₀bV²(κ−1)/(2d)).

02

This force is independent of insertion length x.

03

Capacitance increases linearly with x as dielectric fills in.

Formulas

C(x)

x = inserted length, b = width.

Pulling force

Independent of x.

Important Points

If battery removed (Q fixed), force still pulls slab in but expression differs slightly.

Net energy decreases as dielectric enters — work goes into heat / kinetic energy.

Dielectric Slab Insertion notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 12 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.