Download App

Electrostatics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectrostatics2 Marks
Question
A capacitor with capacitance C is changed to potential V. What is its electrical energy ?
✓

Answer

Electrical energy of capacitor
$U=\frac{Q^{2}}{2C}$ ...(1)
Where $Q=CV$
In equation (1) the value of Q
$U=\frac{(CV)^{2}}{2C}$
$U=\frac{1}{2}CV^{2}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Electrostatics→Electrostatics — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

A long straight wire carrying a current of $30 A$ is placed in an external uniform magnetic field of $4.0 \times 10^{-4} T$ parallel to the current. Find the magnitude of the resultant magnetic field at a point $2.0 \ cm$ away from the wire.
→
Explain the thermonuclear fusion from the fusion of helium atom in the interior of a star and the Red Giant of the Sun.
→
The potential difference across the terminals of a battery of emf 12V and internal resistance $2\Omega$ drops to 10V when it is connected to a silver voltameter. Find the silver deposited at the cathode in half an hour. Atomic weight of silver is 107.9g/mole.
→
Light falls from glass $(\mu=1.5)$ to air. Find the angle of incidence for which the angle of deviation is 90°.
→
Explain why the spectrum of hydrogen atom has many lines, although a hydrogen atom contains only one electron.
→
Calculate the torque on the square plate of the previous problem if it rotates about a diagonal with the same angular acceleration.
→
Draw a labelled ray diagram to show the image formation in a refracting type astronomical telescope. Why should the diameter of the objective of a telescope be large?
→
Considering the case of a parallel plate capacitor being charged, show how one is required to generalize Ampere’s circuital law to include the term due to displacement current.
→
A compound microscope forms an inverted image of an object. In which of the following cases it is kely to create difficulties?
  1. Looking at small germs.
  2. Looking at circular spots.
  3. Looking at a vertical tube containing some water.
→
A simple pendulum of length 40cm is taken inside a deep mine. Assume for the time being that the mine is 1600km deep. Calculate the time period of the pendulum there. Radius of the earth = 6400km.
→