Electric Potential — Chapter Summary
ICSE · Class 12 · Physics
Summary of Electric Potential for ICSE Class 12 Physics. Key concepts: Electric potential at a point, Potential difference between and An electron.
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Overview
Electric potential is the scalar way of describing the electric effect at a point, while electric field intensity describes it as a vector. Potential is defined through the work done in bringing a unit positive test charge from infinity to a point in an electric field. It helps in understanding pote
Key Concepts
Electric potential at a point
Electric potential at a point is the work done by an external agent in carrying a unit positive test charge from infinity to that point in the electri
Potential difference between two points
Potential difference between two points A and B is the work done by an external agent in carrying a unit positive test charge from B to A. It is given
An electron
An electron-volt is the work done in taking one electron through a potential difference of 1 volt. It is a small unit of energy used in atomic physics
The potential due to a point
The potential due to a point charge q at distance r in a medium of dielectric constant K is V = (1/4πϵ0K)(q/r). For vacuum or air, K = 1. The sign of
Since potential is scalar
Since potential is scalar, the total potential due to several point charges is the algebraic sum of their individual potentials: V = (1/4πϵ0) Σ(qi/ri)
Learning Objectives
- Understand the meaning of electric potential as work done per unit positive test charge.
- Distinguish clearly between electric potential, potential difference, electric field intensity, and potential gradient.
- Use the relation between electric potential and electric field intensity.
- Calculate potential due to a point charge, a group of point charges, and a dipole.
- Understand and apply the idea of equipotential surfaces.
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