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The first one is:

A homemade capacitor is assembled by placing two 15-cm pie tins 20 cm apart and connecting them to opposite terminals of a battery. Calculate the following:

a) the capacitance

b) the charge on each plate

c) the electric field halfway between the plates

d) the work done by the battery to charge the plates

I was able to get part a, but I don't know where to begin for parts b,c, and d.

The second problem uses Kirchhoff's Rules.

Find the current in each of the three resistors of the circuit below:

I did not have any idea where to start with this one. I believe it has something to do with loops.

Any help on either of this would really be appreciated.