Question 22N.1.HL.TZ0.30

A parallel-plate capacitor is fully charged using a battery.

The capacitor has a capacitance C and a charge Q. The plates X and Y of the capacitor are a distance d apart. Edge effects are negligible.

Three statements about the fully charged capacitor are:

I.    The electric field strength between the plates is $\frac{Q}{Cd}$.

II.   The electric field lines are at right angles to the plates.

III.  The equipotential surfaces are parallel to the plates.

Which statements are correct?

A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III