Electrostatics

Kindly go through the solution

C = 3Aε₀/d

d

Direction of E is perpendicular to equipotential surface.

$C_1=1\mu F{V}_1=100V?U_1=\frac{1}{2}\times 1\times {10}^{-6}\times {\left(100\right)}^2=5\times {10}^{-3}J$  

$C_2=1\mu F$ , common potential $V=\frac{C_1{V}_1}{C_1{C}_2}=\frac{100}{2}=50V$

Final electrostatic energy stored in both the capacitors.

$=\frac{1}{2}\left(C_1+C_2\right)V^2=\frac{1}{2}\times 2\times {\left(50\right)}^2\times {10}^{-6}$

$=2.5\times {10}^{-3}J$

$Energylost=2.5\times {10}^{-3}$

$\%lossofenergy=\frac{2.5\times {10}^{-3}}{5\times {10}^{-3}}\times 100$

$=50\%$

From work energy theorem

$W_{sp}+W_E=?K$

$-\frac{1}{2}k{x}_0^2+QE.x_0=0$

$?x_0=\frac{2QE}{k}$

(Explanation can be elaborate)

For a region of constant electric potential

(1) The electric field may be uniform

(2) The electric field may be zero

(3) There can be no charge inside the region

Direction of  is perpendicular to equipotential surface.

$C_1=1\mu F{V}_1=100V?U_1=\frac{1}{2}\times 1\times {10}^{-6}\times {\left(100\right)}^2=5\times {10}^{-3}J$  

$C_2=1\mu F$ , common potential $V=\frac{C_1{V}_1}{C_1{C}_2}=\frac{100}{2}=50V$

Final electrostatic energy stored in both the capacitors.

$=\frac{1}{2}\left(C_1+C_2\right)V^2=\frac{1}{2}\times 2\times {\left(50\right)}^2\times {10}^{-6}$

$=2.5\times {10}^{-3}J$

$Energylost=2.5\times {10}^{-3}$

$\%lossofenergy=\frac{2.5\times {10}^{-3}}{5\times {10}^{-3}}\times 100$

$=50\%$  

$C_{eq}=2C=\frac{2A{\epsilon }_0}{d}$