A capacitor is made of a flat plate of area A and a second plate constructed like a staircase as shown in the figure. The capacitance of the arrangement is
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a
ε0Ad
b
1811ε0Ad
c
1118ε0Ad
d
ε0A3d
answer is C.
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Detailed Solution
All the steps of stair makes three parallel capacitors.Ceq=C1+C2+C3=ε0A3d+ε0A3×2d+ε0A3×3d=11ε0A18d