(B) The energy stored in a capacitor is given by $U = \frac{1}{2}CV^2$.Given: $C = 40\ \mu F = 40 \times 10^{-6}\ F$,$V = 3000\ V$,and $t = 2\ ms = 2

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(B) The energy stored in a capacitor is given by $U = \frac{1}{2}CV^2$.Given: $C = 40\ \mu F = 40 \times 10^{-6}\ F$,$V = 3000\ V$,and $t = 2\ ms = 2 \times 10^{-3}\ s$.Substituting the values:$U = \frac{1}{2} \times (40 \times 10^{-6}) \times (3000)^2 = 20 \times 10^{-6} \times 9 \times 10^6 = 180\ J$.The power delivered is $P = \frac{U}{t} = \frac{180\ J}{2 \times 10^{-3}\ s} = 90 \times 10^3\ W = 90\ kW$.

Class 12 Physics Electric Potential and Capacitance Energy Stored in a Capacitor

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In a defibrillator,a $40\ \mu F$ capacitor is charged to $3000\ V$. If the stored energy of the capacitor is discharged through the patient during a pulse of duration $2\ ms$,what is the power delivered to the patient in $kW$?

A
$45$
B
$90$
C
$180$
D
$360$

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Class 12 Questions

Class 12

Physics Questions

Chapter

Electric Potential and Capacitance

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Energy Stored in a Capacitor

$A$ parallel plate capacitor has a uniform electric field '$E$' in the space between the plates. If the distance between the plates is '$d$' and the area of each plate is '$A$', what is the energy stored in the capacitor?

MediumKCET 2026

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How much work is required to increase the voltage of a $6\,\mu F$ capacitor from $10\ V$ to $20\ V$?

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In the circuit shown in the figure,four capacitors are connected to a battery. The maximum energy is stored in the capacitor of.....$\mu F$

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$A$ battery does $200 \, J$ of work in charging a capacitor. The energy stored in the capacitor is ......... $J$.

Medium

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The mean electrical energy density between the plates of a charged air capacitor is (where $q=$ charge on capacitor,$A=$ area of capacitor plate):

MediumMHT CET 2023

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In a defibrillator,a $40\ \mu F$ capacitor is charged to $3000\ V$. If the stored energy of the capacitor is discharged through the patient during a pulse of duration $2\ ms$,what is the power delivered to the patient in $kW$?

Similar Questions

$A$ parallel plate capacitor has a uniform electric field '$E$' in the space between the plates. If the distance between the plates is '$d$' and the area of each plate is '$A$', what is the energy stored in the capacitor?

How much work is required to increase the voltage of a $6\,\mu F$ capacitor from $10\ V$ to $20\ V$?

In the circuit shown in the figure,four capacitors are connected to a battery. The maximum energy is stored in the capacitor of.....$\mu F$

$A$ battery does $200 \, J$ of work in charging a capacitor. The energy stored in the capacitor is ......... $J$.

The mean electrical energy density between the plates of a charged air capacitor is (where $q=$ charge on capacitor,$A=$ area of capacitor plate):

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