Question

A parallel-plate capacitor is made from two plates 12.0cm on each side and 4.50mm apart. Half of the space between these plates contains only air, but the other half is filled with Plexiglas of dielectric constant 3.40. An 18.0 V battery is connected across the plates.
What is the capacitance of this combination.

So I was using the formula C=(epsilon x area)/d
I'm not getting the right answer
bobpursley
Of course you are not getting the right answer.

This is two parallel plate capacitors in parallel. Figure C for each, then add them.
Yes, because you suck. That formula is the most basic one of the chapter. Study more you twat

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