A slab of copper of thickness y is inser...

A slab of copper of thickness y is inserted between the plates of parallel plate capacitor as shown in figure. The separation between the plates is d. If `y=d/4`, then the ratio of capacitance of the capacitor after nd before inserting the slab is

`sqrt 2 : 1`

`4:3`

`1:1`

`4:2`

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