Force between the plates of a parallel plate capacitor

1. A.
   $\frac{V^2}{dC}$
2. B.
   $\frac{C^2 V^2}{d^2}$
3. C.
   $\frac{CV^2}{2d}$
4. D.
   $\frac{C^2 V^2}{2d^2}$

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1. A.
   $QE^2$
2. B.
   $QE$
3. C.
   $\dfrac{QE}{2}$
4. D.
   $\dfrac{QE^2}{2}$

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1. A.
   $F \propto \sqrt{d}$
2. B.
   $F \propto d$
3. C.
   independent of $d$
4. D.
   $F \propto \dfrac{1}{d}$

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