What is the formula for capacitance of a capacitor?
The generalised equation for the capacitance of a parallel plate capacitor is given as: C = ε(A/d) where ε represents the absolute permittivity of the dielectric material being used.
How can you increase the capacitance of a parallel plate capacitor?
The capacitance of a set of charged parallel plates is increased by the insertion of a dielectric material. The capacitance is inversely proportional to the electric field between the plates, and the presence of the dielectric reduces the effective electric field.
Can we give as much charge to a capacitor as we wish?
You can give any amount of charge to capacitor so long as its rated voltage is not exceeded.
Can we give infinite charge to a conductor in vacuum?
Answer: Technically, storing or providing infinite charge to a conductor is not possible. Since every material is made up of it’s constituent atoms, there has to be a limit to which a conductor can accommodate the atoms.
What happens if the plates of a charged capacitor are suddenly connected by a conducting wire?
When the plates of a charged capacitor, is suddenly connected to each other by wire, then, the charge will begin to flow from positive to negative plate. Therefore, the capacitor gets discharged immediately.
What is the basic difference between a charged capacitor and an electric cell?
Capacitor vs Battery
| Capacitor | Battery |
|---|---|
| The potential energy is stored in the electric field | The potential energy is stored in the form of chemical energy which is later converted to electric energy |
| It is a passive component of a circuit | It is an active component of a circuit |
Can a capacitor charge a battery?
Yes a charged capacitor can charge battery without any doubt if the voltage ratings of capacitor are sufficient to charge but the time it can charge depends on the capacitance of the capacitor.
How will we know if the capacitor is fully charged?
The voltage across the 100uf capacitor is zero at this point and a charging current ( i ) begins to flow charging up the capacitor until the voltage across the plates is equal to the 12v supply voltage. The charging current stops flowing and the capacitor is said to be “fully-charged”.