MCQ
Work done by an external agent in separating the parallel plate capacitor is
  • A
    $CV$
  • B
    $\frac{1}{2}{C^2}V$
  • $\frac{1}{2}C{V^2}$
  • D
    None of these

Answer

Correct option: C.
$\frac{1}{2}C{V^2}$
c
(c)

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

Similar questions

The waves used in telecommunication are
A current of $2\, mA$ was passed through an unknown resistor which dissipated a power of $4.4\, W$. Dissipated power when an ideal power supply of $11\, V$ is connected across it is
The anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal:
Which of the following about potential difference between any two points is true?
$i.$ It depends only on the initial and final position.
$ii.$ It is the work done per unit positive charge in moving from one point to other.
$iii.$ It is more for a positive charge of two units as compared to a positive charge of one unit.
The time constant of a circuit is $10\, sec$, when a resistance of $10\, \Omega$ is  connected in series in a previous circuit then time constant becomes $2$ $second$ , then the  self inductance of the circuit is.....$H$
Two different metals are joined end to end. One end is kept at constant temperature and the other end is heated to a very high temperature. The graph depicting the thermo e.m.f. is
Assertion : The refractive index of diamond is $\sqrt 6$ and that of liquid is $\sqrt 3$ . If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is $30^o$.

Reason : $\mu  = \frac{1}{{\sin \,C}}$ , where $\mu $ is the refractive index of diamond with respect to liquid

$​​​​50\%$ of the $X-$rays coming from a Coolidge tube are able to pass through a $0.1\ mm$ thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the $X-$rays passing through the same foil will be:
Find the equivalent resistance across AB
On heating a semiconductor