PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Electrostatic Potential and Capacitance>Energy Stored in a Capacitor

Energy Stored in a Capacitor

Author:Karnataka Board

12th Karnataka Board

IMPORTANT

Energy Stored in a Capacitor: Overview

In this topic, we are going to explore how and in what form the energy is stored for a system. It explains with derivation and examples for better insight into the concept.

Important Questions on Energy Stored in a Capacitor

HARD

IMPORTANT

PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Electrostatic Potential and Capacitance>Energy Stored in a Capacitor> Q 1

A $4 μF$ capacitor is charged by a $200 V$ supply. It is then disconnected from the supply and is connected to another uncharged $2 μF$ capacitor. How much electrostatic energy of the first capacitor is lost in the form of heat and electromagnetic radiation?

HARD

IMPORTANT

PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Electrostatic Potential and Capacitance>Energy Stored in a Capacitor> Q 2

The plates of a parallel plate capacitor have an area of $90 {cm}^{2}$ each and are separated by $2.5 mm$ . The capacitor is charged by connecting it to a $400 V$ supply. How much electrostatic energy is stored by the capacitor? View this energy as electrostatic field stored between the plates of capacitor, energy per unit volume, $u$ . Hence arrive at a relation between $u$ and magnitude of electric field $E$ between the plates.

MEDIUM

IMPORTANT

PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Electrostatic Potential and Capacitance>Energy Stored in a Capacitor> Q 3

A $600 pF$ capacitor is charged by a $200 V$ supply. It is then disconnected from the supply and is connected to another uncharged $600 pF$ capacitor. How much electrostatic energy is lost in the process?

EASY

IMPORTANT

PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Electrostatic Potential and Capacitance>Energy Stored in a Capacitor> Q 4

A $12 pF$ capacitor is connected to a $50 V$ battery. How much electrostatic energy is stored in the capacitor?