1. The problem statement, all variables and given/known data A homemade capacitor is assembled by placing two 9-in. pie pans 4 cm apart and connecting them to the opposite terminals of a 9-V battery. Estimate (c) the electric field halfway between the plates. 2. Relevant equations V=E x d 3. The attempt at a solution As it says "halfway" I assumed the voltage should be taken as "average voltage", 4.5 Volt. So my E value is different than solution manual. Solution manual says it's 9V as the field is uniform. If the field is uniform , what does it say "halfway" for?? We use average voltage Vf/2 when calculating energy stored in a capacitor why don't we use it here??