The work done in bringing a unit positive charge from infinity to a point in an electric field.
Where:
Unit: Volt (V), where \( 1 \, V = 1 \, J/C \)
Like lifting a ball onto a shelf = work done. Bringing a charge to a point = electrostatic potential.
The electric potential at a distance from a point charge.
Where:
PYQ Type: Formula MCQ
The work done in moving a unit charge from one point to another in an electric field.
AAI ATC Focus: Unit-based or formula definition
Definition: The ability of a system to store charge per unit potential difference.
Where:
Your phone’s battery acts like a capacitor storing charge.
PYQ Type: Unit of capacitance / formula
Capacitance for parallel plates without and with dielectric.
Where:
PYQ Type: Theory or unit matching Q in exams
The energy stored when a capacitor is charged.
Unit: Joules (J)
Like energy stored in a power bank before you use it.
PYQ Type: Concept MCQ
2021 Shift 2: Unit of capacitance (Farad)
2022 Shift 3: Formula of parallel plate capacitance
2023 Feb Shift 1: Potential difference formula based MCQ
| Formula | Meaning |
|---|---|
| \( V = \frac{W}{q} \) | Electrostatic potential |
| \( V = \frac{k Q}{r} \) | Potential due to point charge |
| \( C = \frac{Q}{V} \) | Capacitance |
| \( C = \frac{\epsilon_0 A}{d} \) | Parallel plate capacitor |
| \( U = \frac{1}{2} C V^2 \) | Energy stored in a capacitor |
| Concept | GenZ Example |
|---|---|
| Higher charge = more potential | Balloon stores more charge when rubbed longer |
| Closer capacitor plates = more capacitance | Tighter packed power bank stores more energy |
| Dielectric increases capacitance | Adding plastic inside a capacitor boosts storage |
| Energy stored = power bank energy before phone charge |
Focus Areas: