A parallel plate capacitor has a uniform electric field $E$ in the space between the plates. If the distance between the plates is $d$ and area of each plate is $A$ , the energy stored in the capacitor is

  • A

    $\frac{1}{2}{\varepsilon _0}{E^2}Ad$

  • B

    ${\varepsilon _0}{E}Ad$

  • C

    $\frac{1}{2}{\varepsilon _0}{E^2}$

  • D

    ${E^2}Ad/{\varepsilon _0}$

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In steady state heat conduction, the equations that determine the heat current $j ( r )$ [heat flowing per unit time per unit area] and temperature $T( r )$ in space are exactly the same as those governing the electric field $E ( r )$ and electrostatic potential $V( r )$ with the equivalence given in the table below.

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