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Why Does a Capacitor Still Have Voltage After Being Disconnected From a Battery?

Why Does a Capacitor Still Have Voltage After Being Disconnected From a Battery?

by Raul Barrea | Oct 22, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: A capacitor can still have voltage after being disconnected from a battery because opposite charges remain separated on its plates. These charges create an electric field and a potential difference, even when the battery is no longer...
Why Does Increasing the Distance Between Capacitor Plates Decrease Capacitance?

Why Does Increasing the Distance Between Capacitor Plates Decrease Capacitance?

by Raul Barrea | Oct 22, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Increasing the distance between the plates of a parallel-plate capacitor decreases capacitance because the same separated charge produces a larger voltage across the wider gap. Since capacitance is charge divided by voltage, the...
Why Is Electric Potential Different From Electric Potential Energy?

Why Is Electric Potential Different From Electric Potential Energy?

by Raul Barrea | Oct 19, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Electric potential is the electric potential energy per unit charge at a location, while electric potential energy belongs to a particular charged object in that electric environment. Two different charges can be at the same electric...
Can Electric Field Be Zero Where Electric Potential Is Not Zero?

Can Electric Field Be Zero Where Electric Potential Is Not Zero?

by Raul Barrea | Oct 19, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Yes. The electric field can be zero at a point while the electric potential there is not zero. Electric field contributions are vectors and can cancel because they point in opposite directions. Electric potential contributions are...
Can Electric Potential Be Zero Where Electric Field Is Not Zero?

Can Electric Potential Be Zero Where Electric Field Is Not Zero?

by Raul Barrea | Oct 19, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Yes. Electric potential can be zero at a point even when the electric field is not zero. Potential is a value; electric field depends on how that value changes from place to place. For example, halfway between equal positive and...
Why Does Adding a Dielectric Increase Capacitance?

Why Does Adding a Dielectric Increase Capacitance?

by Raul Barrea | Oct 19, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Adding a dielectric increases a capacitor’s capacitance because the material becomes polarized in the electric field between the plates. Its polarization partly opposes the field produced by the free charges on the plates. With the...
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