MCQ
Force of attraction between the plates of a parallel plate capacitor is
  • $\frac{q^2}{2 \varepsilon_0 A K}$
  • B
    $\frac{q^2}{\varepsilon_0 A K}$
  • C
    $\frac{q}{2 \varepsilon_0 A}$
  • D
    $\frac{q^2}{2 \varepsilon_0 A^2 K}$

Answer

Correct option: A.
$\frac{q^2}{2 \varepsilon_0 A K}$
$\frac{q^2}{2 \varepsilon_0 A K}$

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

Similar questions

An experiment to verify ohm's law, a conductor of resistance R is taken. During the experiment, temperature of the conductor increases with the flow of current. Resistance of the conductor will:
L, C and R represent the physical quantities inductance, capacitance and resistance respectively. Which of the following combinations have dimensions of frequency?
  1. $\frac{1}{\text{RC}}$
  2. $\frac{\text{R}}{\text{L}}$
  3. $\frac{1}{\sqrt{\text{LC}}}$
  4. $\text{C}/\text{L}$
In the lowest energy level of hydrogen atom, the electron has the angular momentum
The three vessels shown in fisure $(13- Q2)$ have same base area. Equal volumes of a liquid are poured in the three vessels. The force on the base will be$:$
For intensity I of a light of wavelength 5000Å the photoelectron saturation current is 0.40 μA and stopping potential is 1.36 V, the work function of metal is(a) 2.47 eV(b) 1.36 eV(c) 1.10 eV(d) 0.43 eV
       
In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will:
  1. Increase.
  2. Decrease.
  3. Remain the saint.
  4. May increase or decrease.
A star moves away from earth at speed $0.8\ c$ while emitting light of frequency $6\times 10^{14} Hz$ What frequency will be observed on the earth $($in units of $10^{14}Hz) (c =$ speed of light$)$
What is the resistivity of a pure semiconductor at absolute zero?
If a charged particle moves unaccelerated in a region containing electric and magnetic fields,
An electric bulb marked $40 W - 200 V$ is used in a circuit of supply voltage $100 V.$ Now its power is: