If you have ever tried to hang a picture or a mirror, you know it can be difficu

Question

If you have ever tried to hang a picture or a mirror, you know it can be difficult to locate a wooden stud in which to anchor your nail or screw. A carpenter's stud finder is a capacitor with its plates arranged side by side instead of facing each other as shown in the figure below. When the device is moved over a stud, does the capacitance increase or decrease?

increasedecrease   

The materials between the plates of the capacitor are the wallboard and air. Capacitor plates Stud Stud finder Wallboard When the capacitor moves across a stud in the wall, the materials between the plates are the wallboard and the wood stud. The change in the dielectric constant causes a signal light to illuminate

Explanation / Answer

The Capacitance increases because of increased dielectric constant as now stud is also a part of dielectric.

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