- #1

theconfusedphysicist

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- TL;DR Summary
- Dielectric slab in a capacitor connected at potential difference V.

Why is the slab thrown out?

A capacitor consisting of 2 square metal plates placed at a certain distance is connected to a potential difference generator V.

A slab of dielectric material is inserted into the space between the armatures.

By doing the calculation of the derivative of the electrostatic energy with respect to the x-coordinate, one obtains that the force acting on this slab is such as to pull it into the capacitor.

However, if you do the experiment, it turns out that the slab is thrown out of the capacitor by a repulsive force.

Why?

Thanks

A slab of dielectric material is inserted into the space between the armatures.

By doing the calculation of the derivative of the electrostatic energy with respect to the x-coordinate, one obtains that the force acting on this slab is such as to pull it into the capacitor.

However, if you do the experiment, it turns out that the slab is thrown out of the capacitor by a repulsive force.

Why?

Thanks