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  • A slab of copper of thickness y is inserted in between the plates of parallel plate capacitor as shown in figure. The separation between the plates is d. If <img alt="y=\frac{d}{4}" src="https

A slab of copper of thickness y is inserted in between the plates of parallel plate capacitor as shown in figure. The separation between the plates is d. If y=\frac{d}{4}, then the ratio of capacitance of the capacitor after and before inserting the slab is-

Option: 1

\sqrt{2}:1


Option: 2

4 : 3


Option: 3

1 : 1


Option: 4

4 : 2


Answers (1)

best_answer

\text{For the relation}\\\\\ c \alpha \frac{1}{d} \longrightarrow \text{separation}\\\\. C^{\prime} \propto \frac{1}{d-d / 4}\\\\\\\ \text{Now,}\\\\\\ \begin{aligned} & \frac{C^{\prime}}{C}=\frac{1}{3 d / 4} \times d=4 / 3 \\ & \frac{C^{\prime}}{C}=4 / 3 \end{aligned}

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Devendra Khairwa

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