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The space between the plates of a parallel-plate capacitor of capacitance C is filled with three dielectric slabs of identical size as shown in figure. If the dielectric constants of the three slabs areK1, K2  and  K3,  then find the new capacitance
 

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a
Ceq=K1+K2+K3C3
b
Ceq=K1+K2+K32C3
c
Ceq=K1+K2+K33C3
d
Ceq=K1+K2+K34C3

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detailed solution

Correct option is A

Consider each one third of the assembly as a separate capacitor. The three positive plates are connected together at point A and the three negative plates are connected together at point B. Thus, the three capacitors are joined in parallel. As the plate area is one third of the original for each part, the capacitances of these parts will be K1C/3,  K2C/3  and K3C/3  . The equivalent capacitance is, therefore,  Ceq=K1+K2+K3C3
 

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