Download App

2. Electric potential and capacitance — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics2. Electric potential and capacitance1 Mark
MCQ
Two charged capacitors have their outer plates fixed and inner plates connected by a spring of force constant ' $k$ '. The charge on each capacitor is q. Find the extension in the spring at equilibrium
  • ✓
    $\frac{q^2}{2 A \varepsilon_0 k}$
  • B
    $\frac{q^2}{4 A \varepsilon_0 k}$
  • C
    $\frac{q^2}{A \varepsilon_0 k}$
  • D
    $0$
✓

Answer

Correct option: A.
$\frac{q^2}{2 A \varepsilon_0 k}$
a
(a)

$F=k x=\frac{q^2}{2 A \varepsilon_0}$

$x=\frac{q^2}{2 A \varepsilon_0 k}$

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 "M.C.Q (1 Marks)" from 2. Electric potential and capacitance→2. Electric potential and capacitance — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Basically, the product modulator is
→
An electric bulb rated for $500\, watts$ at $100\, volts$ is used in a circuit having a $200-volt$ supply. The resistance $R$ that must be put in series with the bulb, so that the bulb draws $500\, W$ is .................. $\Omega$
→
Water molecule is the example of:
→
In a Fresnel baptism experiment, the two positions of lens give separation between the slits as $16 \;cm$ and $9\; cm$ respectively. What is the actual distance of separation (in $cm$)?
→
In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively, will be
→
Two magnets of equal mass are joined at right angles to each other as shown the magnet $1$ has a magnetic moment $3 $ times that of magnet $2$. This arrangement is pivoted so that it is free to rotate in the horizontal plane. In equilibrium what angle will the magnet $1$ subtend with the magnetic meridian
→
Which one did Rutherford consider to be supported by the results of experiments in which $\alpha  - $ particles were scattered by gold foil?
→
A screen is placed at a certain distance from a narrow slit which is illuminated by a parallel beam of monochromatic light. What will you observe if you scan the screen  with the help of microscope
→
The focal length of a concave mirror is $f$ and the distance from the object to the principle focus is $x$. The ratio of the size of the image to the size of the object is
→
In the circuit shown in figure, the current drawn from the battery is $4\,A$. If $10 \,\Omega$ resistor is replaced by $20\,\Omega$ resistor, then current drawn from the circuit will be .............. $A$
→