Q 2555412364.     Two parallel plate capacitors differ only in the spacing between their (very thin) plates; one, AB, has a spacing of 5 mm and a capacitance of 20 pF, the other, CD. has a spacing of 2 mm. Plates A and C carry charges of + 1 nC, whilst B and D each carry -1 nC. What are the potential differences `V_(AB)` and `V_(CD)` after the capacitor CD is slid centrally between and parallel to the plates of A B without touching them'? Would it make any difference if CD were not centrally placed between A and B '?

A

`V_(AB)=40, V_(CD)=70`

B

`V_(AB)=70, V_(CD)=40`

C

`V_(AB)=55, V_(CD)=55`

D

None of these.

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