The force between the plates of a parallel plate capacitor of capacitance $C$ and distance of separation of the plates $d$ with a potential difference $V$ between the plates,is
- A$\frac{CV^2}{2d}$
- B$\frac{C^2V^2}{2d^2}$
- C$\frac{C^2V^2}{d^2}$
- D$\frac{V^2d}{C}$
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Similar Questions
Names of units of some physical quantities are given in List-$I$ and their dimensional formulae are given in List-$II$. Match the correct pairs in the lists:
$A$. $Pa \cdot s$ $(i)$ $[L^2 \ T^{-2} \ K^{-1}]$ $B$. $N \cdot m \cdot K^{-1}$ $(ii)$ $[M \ L \ T^{-3} \ K^{-1}]$ $C$. $J \cdot kg^{-1} \cdot K^{-1}$ $(iii)$ $[M \ L^{-1} \ T^{-1}]$ $D$. $W \cdot m^{-1} \cdot K^{-1}$ $(iv)$ $[M \ L^2 \ T^{-2} \ K^{-1}]$
| $A$. $Pa \cdot s$ | $(i)$ $[L^2 \ T^{-2} \ K^{-1}]$ |
| $B$. $N \cdot m \cdot K^{-1}$ | $(ii)$ $[M \ L \ T^{-3} \ K^{-1}]$ |
| $C$. $J \cdot kg^{-1} \cdot K^{-1}$ | $(iii)$ $[M \ L^{-1} \ T^{-1}]$ |
| $D$. $W \cdot m^{-1} \cdot K^{-1}$ | $(iv)$ $[M \ L^2 \ T^{-2} \ K^{-1}]$ |
Which of the following statements is true?
An infinitely long rod lies along the axis of a concave mirror of focal length $f$. The near end of the rod is at a distance $u > f$ from the mirror. Its image will have a length:
The equation of a straight line,perpendicular to $3x - 4y = 6$ and forming a triangle of area $6$ sq. units with the coordinate axes,is
If $u=\sin ^{-1}\left(\frac{x}{y}\right)+\tan ^{-1}\left(\frac{y}{x}\right)$,then the value of $x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}$ is
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